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<!DOCTYPE html>
<html>
<head>
<title>ETL on R</title>
<meta charset="utf-8">
<meta name="description" content="ETL on R">
<meta name="author" content="Cheng Yu Lin (aha) and Jia Wei Chen (jiawei)">
<meta name="generator" content="slidify" />
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<script>window.jQuery || document.write('<script src="libraries/widgets/quiz/js/jquery.js"><\/script>')</script>
<script data-main="libraries/frameworks/io2012/js/slides"
src="libraries/frameworks/io2012/js/require-1.0.8.min.js">
</script>
</head>
<body style="opacity: 0">
<slides class="layout-widescreen">
<!-- LOGO SLIDE -->
<slide class="title-slide segue nobackground">
<hgroup class="auto-fadein">
<h1>ETL on R</h1>
<h2></h2>
<p>Cheng Yu Lin (aha) and Jia Wei Chen (jiawei)<br/></p>
</hgroup>
<article></article>
<footer class = 'license'>
<a href='http://creativecommons.org/licenses/by-sa/3.0/'>
<img width = '80px' src = 'http://mirrors.creativecommons.org/presskit/buttons/88x31/png/by-sa.png'>
</a>
</footer>
</slide>
<!-- SLIDES -->
<slide class="" id="slide-1" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>故事的起源</h2>
</hgroup>
<article data-timings="">
<div style='float:left;width:30%' >
<ol>
<li><code>房價真的太高了嗎?</code></li>
</ol>
</div>
<div style='float:right;width:66%'>
<p><img src = './resources/figures/R_ETL_NEWS3.png' height="400px"></img></p>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-2" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>故事的起源</h2>
</hgroup>
<article data-timings="">
<div style='float:left;width:30%' >
<ol>
<li>房價真的太高了嗎?</li>
<li><code>大熊被抓了</code></li>
</ol>
</div>
<div style='float:right;width:66%'>
<p><img src = './resources/figures/R_ETL_NEWS_2.png' height="400px"></img></p>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-3" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>故事的起源</h2>
</hgroup>
<article data-timings="">
<div style='float:left;width:30%' >
<ol>
<li>房價真的太高了嗎?</li>
<li>大熊被抓了</li>
<li><code>台灣房市真的要崩盤了嗎？</code></li>
</ol>
</div>
<div style='float:right;width:66%'>
<p><img src = './resources/figures/R_ETL_NEWS_1.png' height="400px"></img></p>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-4">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
</hgroup>
<article class = 'flexbox vcenter'>
<p><q>在論述台灣房市之前，身為一個<code>資料科學家</code>，第一步是了解問題</q></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-5">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
</hgroup>
<article class = 'flexbox vcenter'>
<p><q>本次，我們的問題是<code>房價真的太高了嗎?</code></q></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-6" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<article data-timings="">
<p>還記得這個<code>新聞</code>吧？ 就從這裡開始
<img src = './resources/figures/R_ETL_NEWS_1.png' height="400px"></img></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-7" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>資料在哪裡</h2>
</hgroup>
<article data-timings="">
<p>從上面<code>新聞</code>所述，所以我們想要:</p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-8" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>資料在哪裡</h2>
</hgroup>
<article data-timings="">
<p>從上面<code>新聞</code>所述，所以我們想要:</p>
<div style='float:left;width:48%;'>
<h3><code>你想知道什麼資料?</code></h3>
<ol>
<li>GDP</li>
<li>房貸餘額</li>
<li>股價</li>
<li>新聞</li>
<li>地價資訊</li>
</ol>
</div>
<div style='float:right;width:48%;'>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-9" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>資料在哪裡</h2>
</hgroup>
<article data-timings="">
<p>從上面<code>新聞</code>所述，所以我們想要:</p>
<div style='float:left;width:48%;'>
<h3><code>你想知道什麼資料?</code></h3>
<ol>
<li>GDP</li>
<li>房貸餘額</li>
<li>股價</li>
<li>新聞</li>
<li>地價資訊</li>
</ol>
</div>
<div style='float:right;width:48%;'>
<h3><code>可能的來源?</code></h3>
<ol>
<li>政府公開資料
<ul>
<li>主計處</li>
<li>央行</li>
</ul></li>
<li>新聞
<ul>
<li>紙本報紙</li>
<li>電視新聞</li>
<li>電子新聞</li>
</ul></li>
<li>股市
<ul>
<li>Yahoo Stock API</li>
</ul></li>
</ol>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-10">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
</hgroup>
<article class = 'flexbox vcenter'>
<p><q>即便知道資料在哪，可是資料還是如同<code>一盤散沙</code></q></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-11" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>看看Raw Data</h2>
</hgroup>
<article data-timings="">
<p><img src = './resources/figures/R_ETL_RAWDATA.png' height="350px"></img></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-12" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>我們ETL會用到的有</h2>
</hgroup>
<article data-timings="">
<ul>
<li><code>dplyr</code> 可用<code>類似SQL方法</code>操作data frome</li>
<li><code>xts</code> 處理<code>時間</code>格式好用的套件</li>
<li><code>gdata</code> 可以處理<code>Excel 2007</code>以上的文件</li>
<li><code>quantmod</code> 可以處理<code>股市</code>資料</li>
<li><code>stringr</code> <code>字串</code>相關處理</li>
</ul>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="quote" id="slide-13" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<article data-timings="">
<p><q>來上課的，有<code>福</code>了</q></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-14" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>DSC的One Piece</h2>
</hgroup>
<article data-timings="">
<ul>
<li><code>DSC2014Tutorial</code> R社群為了這次Tutorial製作的套件，所有的教材都在這了</li>
</ul>
<pre><code>deps <- available.packages("http://taiwanrusergroup.github.io/R/src/contrib")[1,"Imports"]
pkgs <- strsplit(gsub("\\s", "", deps), ",")[[1]]
for(i in seq_along(pkgs)) {
# You can change your favorite repository
if (require(pkgs[i], character.only = TRUE)) next
install.packages(pkgs[i], repo = "http://cran.csie.ntu.edu.tw")
}
install.packages('DSC2014Tutorial',
repo = 'http://taiwanrusergroup.github.io/R', type = 'source')
library(DSC2014Tutorial)
</code></pre>
<p>安裝之後, 輸入以下指令就可以打開投影片:</p>
<pre><code>slides("ETL")
</code></pre>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-15" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>解決資料散亂的方法 - <code>ETL</code></h2>
</hgroup>
<article data-timings="">
<p><img src = './resources/figures/R_ETL_ETL.png' height="350px"></img></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-16" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>ETL 的主要內容</h2>
</hgroup>
<article data-timings="">
<p><img src = './resources/figures/R_ETL_ETL_3.png' height="350px"></img></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-17" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>今日解決的問題流程 - <code>ETL</code></h2>
</hgroup>
<article data-timings="">
<p><img src = './resources/figures/R_ETL_ETL_2.png' height="350px"></img></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-18" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>今日課程的目標</h2>
</hgroup>
<article data-timings="">
<h3>學會<strong>extraction</strong>, <strong>cleaning</strong>, <strong>transformation</strong></h3>
<ul>
<li>用R整理<code>結構</code>化資料 <strong>STEP1 房貸餘額1</strong> , <strong>STEP2 GDP</strong></li>
<li>用R整理<code>非結構化</code>資料 <strong>STEP3新聞分析</strong></li>
</ul>
<h3>學會 <strong>load</strong></h3>
<ul>
<li>整併全部的資料 STEP4</li>
</ul>
<h3>邁向 <strong>其他有意思的主題</strong></h3>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="dark segue" id="slide-19" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>學習，實作，觀察 STEP1</h2>
</hgroup>
<article data-timings="">
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-20" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>ETL <code>第一步</code></h2>
</hgroup>
<article data-timings="">
<p><img src = './resources/figures/R_ETL_ETL_2.png' height="350px"></img></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-21" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>開始收集資料(房貸餘額)</h2>
</hgroup>
<article data-timings="">
<p>請連線到
<code>https://survey.banking.gov.tw/statis/stmain.jsp?sys=100&funid=r100</code></p>
<iframe src = 'https://survey.banking.gov.tw/statis/stmain.jsp?sys=100&funid=r100' height='400px'></iframe>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-22" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>開始收集資料</h2>
</hgroup>
<article data-timings="">
<h3>房貸餘額,直接下載現成的csv檔案</h3>
<ul>
<li>直接到<a href="https://raw.githubusercontent.com/ntuaha/TWFS/master/db/cl_info_other.csv">https://raw.githubusercontent.com/ntuaha/TWFS/master/db/cl_info_other.csv</a>下載檔案</li>
<li>應該會看見<code>cl_info_other.csv</code></li>
<li>讀入它!</li>
</ul>
<p>或是</p>
<pre><code class="r">library(DSC2014Tutorial)
ETL_file("cl_info_other.csv")
</code></pre>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-23" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>讀入資料 - read.table</h2>
</hgroup>
<article data-timings="">
<p>至少要記得的 <code>read.table</code></p>
<pre><code>Cl_info = read.table(file=ETL_file("cl_info_other.csv"),sep=",",stringsAsFactors=F,header=T)
</code></pre>
<ul>
<li>輸出形態為<code>Data Frame</code></li>
<li>file 就是指讀入的檔案路徑</li>
<li>sep 指的是欄位分割用的符號,通常csv檔案格式是透過<code>,</code>做分割</li>
<li>stringsAsFactors 預設是<code>True</code>, 會讓讀入的字串都用Factor形態儲存，那麼資料就會轉為整數儲存與額外的對照表</li>
<li>header 預設是<code>False</code>，表示第一行是不是表格標頭，作為輸出的dataframe欄位名的colnames</li>
</ul>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-24" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>看看讀入結果</h2>
</hgroup>
<article data-timings="">
<pre><code>View(Cl_info)
str(Cl_info)
</code></pre>
<p><img src = './resources/figures/R_ETL_EXP1.png' height="350px"></img></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="quote" id="slide-25" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<article data-timings="">
<p><q>直接讀入是否覺得怪怪的?</q></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-26" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>再看一次</h2>
</hgroup>
<article data-timings="">
<p><img src = './resources/figures/R_ETL_EXP1.png' height="350px"></img></p>
<ul>
<li><code>etl_dt</code> <code>data_dt</code> 是<code>文字</code>但應該是<code>時間</code></li>
<li><code>bank_code</code> 也是<code>文字</code>但應該是<code>factor</code></li>
</ul>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-27" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>Transformation - 資料處理</h2>
</hgroup>
<article data-timings="">
<h3>將資料讀入</h3>
<pre><code>library(DSC2014Tutorial)
library(dplyr)
Cl_info = read.table(file=ETL_file('cl_info_other.csv'),header=T,sep=",",stringsAsFactors=F)
Cl_info_part = mutate(Cl_info,data_dt = as.POSIXct(data_dt),
bank_code = as.factor(bank_code),etl_dt = as.POSIXct(etl_dt))
View(Cl_info_part)
str(Cl_info_part)
</code></pre>
<p><br/></p>
<ul class = "build incremental">
<li>到這裡已經完成第一次的資料<code>Extraction</code>與<code>Transformation</code>了！</li>
</ul>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="quote" id="slide-28" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<article data-timings="">
<p><q>看見資料了!但是剛剛處理過程中的<code>mutate</code>是什麼?</q></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="quote" id="slide-29" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<article data-timings="">
<p><q>看見資料了!但是剛剛處理過程中的<code>mutate</code>是什麼?</q></p>
<p><q> 在<code>R</code>中用來做<strong>資料清理</strong>與<strong>資料處理</strong>好用的套件<code>dplyr</code>其中之一的函式<q></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="quote" id="slide-30" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<article data-timings="">
<p><q> 接下來我們將介紹三個基本函式 </q></p>
<p><img src = './resources/figures/R_ETL_Fn1.png' height="350px"></img></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-31" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>練習-挑選<code>欄位</code>(1/2)</h2>
</hgroup>
<article data-timings="">
<h3>dplyr <code>select</code> 函式，用來<strong>挑選</strong><code>欄位</code></h3>
<div style='float:left;width:68%' >
<pre><code>Cl_demo1 = select(資料表,欄位1,欄位2,欄位3)
</code></pre>
<ul>
<li><code>第一個參數</code>為輸入的data frame</li>
<li><code>後續參數</code>為選取的欄位名稱</li>
</ul>
<p><br/></p>
<h3>給熟悉<code>SQL</code>的使用者</h3>
<pre><code>select data_dt,bank_nm,mortgage_bal from Cl_info;
</code></pre>
</div>
<div style='float:right;width:28%'>
<p><img src = './resources/figures/R_ETL_DPLYR_SELECT.png'></img></p>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-32" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>練習-挑選<code>欄位</code>(2/2)</h2>
</hgroup>
<article data-timings="">
<h3>dplyr <code>select</code> 函式，用來<strong>挑選</strong><code>欄位</code></h3>
<div style='float:left;width:68%' >
<pre><code>Cl_demo1 = select(Cl_info,data_dt,bank_nm,mortgage_bal)
</code></pre>
<ul>
<li><code>第一個參數</code>為輸入的data frame</li>
<li><code>後續參數</code>為選取的欄位名稱</li>
</ul>
<p><br/></p>
<h3>給熟悉<code>SQL</code>的使用者</h3>
<pre><code>select data_dt,bank_nm,mortgage_bal from Cl_info;
</code></pre>
</div>
<div style='float:right;width:28%'>
<p><img src = './resources/figures/R_ETL_DPLYR_SELECT.png'></img></p>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-33" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>練習-挑選<code>資料</code></h2>
</hgroup>
<article data-timings="">
<h3>dplyr <code>filter</code> 函式，用來<strong>保留</strong>要留下的<code>資料列</code></h3>
<div style='float:left;width:68%' >
<pre><code>Cl_demo2 = filter(Cl_info,mortgage_bal>1000000)
</code></pre>
<ul>
<li><code>第一個參數</code>為輸入的data frame</li>
<li><code>第二個參數</code>為邏輯運算式，可用data frame裡的欄位，當結果為<code>True</code>時，該筆資料列保留</li>
</ul>
<p><br/></p>
<h3>給熟悉<code>SQL</code>的使用者</h3>
<pre><code>select * from Cl_info where mortgage>1000000;
</code></pre>
</div>
<div style='float:right;width:28%'>
<p><img src = './resources/figures/R_ETL_DPLYR_FILTER.png'></img></p>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-34" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>練習-增加<code>特徵</code>欄位(1/2)</h2>
</hgroup>
<article data-timings="">
<h3>dplyr <code>mutate</code> 用來增加<strong>非彙總</strong>計算<code>欄位</code></h3>
<div style='float:left;width:68%' >
<pre><code>Cl_demo3 = mutate(資料表,新欄位名 = 運算式)
</code></pre>
<ul>
<li><code>第一個參數</code>為輸入的 data frame</li>
<li><code>第二參數</code>為計算式，也可以用來當做<strong>轉換資料形態</strong>，<strong>變更欄位為名稱</strong>使用</li>
</ul>
<ul class = "build incremental">
<li>例如: bank_code = as.numeric(bank_code)</li>
</ul>
<p><br/></p>
<h3>給熟悉<code>SQL</code>的使用者</h3>
<pre><code>select mortgage_bal/1000000 as mortage from Cl_info;
</code></pre>
</div>
<div style='float:right;width:28%'>
<p><img src = './resources/figures/R_ETL_DPLYR_MUTATE.png'></img></p>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-35" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>練習-增加<code>特徵</code>欄位(2/2)</h2>
</hgroup>
<article data-timings="">
<h3>dplyr <code>mutate</code> 用來增加<strong>非彙總</strong>計算<code>欄位</code></h3>
<div style='float:left;width:68%' >
<pre><code>Cl_demo3 = mutate(Cl_info,mortage = mortgage_bal/1000000)
</code></pre>
<ul>
<li><code>第一個參數</code>為輸入的 data frame</li>
<li><code>第二參數</code>為計算式，也可以用來當做<strong>轉換資料形態</strong>，<strong>變更欄位為名稱</strong>使用</li>
</ul>
<p><br/></p>
<h3>給熟悉<code>SQL</code>的使用者</h3>
<pre><code>select mmortgage_bal/1000000 as mortage from Cl_info;
</code></pre>
</div>
<div style='float:right;width:28%'>
<p><img src = './resources/figures/R_ETL_DPLYR_MUTATE.png'></img></p>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-36" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>練習-<code>排序</code>資料(1/2)</h2>
</hgroup>
<article data-timings="">
<h3>dplyr <code>arrange</code> 用來重新排序</h3>
<div style='float:left;width:68%' >
<pre><code>Cl_demo4 = arrange(資料表,欄位1,desc(欄位2)))
</code></pre>
<ul>
<li><code>第一個參數</code>為輸入的 data frame</li>
<li><code>後續參數</code>為排序用欄位，預設遞增，可以透過<code>desc()</code>變成遞減排序</li>
</ul>
<p><br/></p>
<h3>給熟悉<code>SQL</code>的使用者</h3>
<pre><code>select * from Cl_info order by mortage,data_dt desc ;
</code></pre>
</div>
<div style='float:right;width:28%'>
<p><img src = './resources/figures/R_ETL_DPLYR_ARRANGE.png'></img></p>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-37" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>練習-<code>排序</code>資料(2/2)</h2>
</hgroup>
<article data-timings="">
<h3>dplyr <code>arrange</code> 用來重新排序</h3>
<div style='float:left;width:68%' >
<pre><code>Cl_demo4 = arrange(Cl_info,mortgage_bal,desc(data_dt))
</code></pre>
<ul>
<li>輸出data frame</li>
<li><code>第一個參數</code>為輸入的 data frame</li>
<li><code>後續參數</code>為排序用欄位，預設遞增，可以透過<code>desc()</code>變成遞減排序</li>
</ul>
<p><br/></p>
<h3>給熟悉<code>SQL</code>的使用者</h3>
<pre><code>select * from Cl_info order by mortage,data_dt desc ;
</code></pre>
</div>
<div style='float:right;width:28%'>
<p><img src = './resources/figures/R_ETL_DPLYR_ARRANGE.png'></img></p>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-38" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>練習時間</h2>
</hgroup>
<article data-timings="">
<ol>
<li>請幫忙從Cl_info_part找出<code>data_dt</code>,<code>bank_nm</code>,<code>mortgage_bal</code></li>
<li>請幫忙從Cl_info_part挑選出<code>mortgage＿bal</code>大於1千萬的銀行資料</li>
<li>請幫忙排序Cl_info_part出<code>mortgage＿bal</code>由小到大，但資料時間<code>data_dt</code>從大到小</li>
<li>請執行下面程式碼，我們後續會利用<code>Cl_info_part2</code></li>
</ol>
<pre><code>Cl_info_part2 = mutate(Cl_info_part,time= as.POSIXct(data_dt))
</code></pre>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="dark segue" id="slide-39" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>學習，實作，觀察 STEP2</h2>
</hgroup>
<article data-timings="">
</article>
<!-- Presenter Notes -->
</slide>
<slide class="quote" id="slide-40" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<article data-timings="">
<p><q>讓我們來練習抓下一個資料<code>GDP</code></q></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-41" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>ETL <code>第二步</code></h2>
</hgroup>
<article data-timings="">
<p><img src = './resources/figures/R_ETL_ETL_2.png' height="350px"></img></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-42" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>開始收集資料(GDP)</h2>
</hgroup>
<article data-timings="">
<p>請連線到 <code>http://ebas1.ebas.gov.tw/pxweb/Dialog/NI.asp</code></p>
<iframe src = 'http://ebas1.ebas.gov.tw/pxweb/Dialog/NI.asp' height='400px'></iframe>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-43" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>開始收集資料(GDP)</h2>
</hgroup>
<article data-timings="">
<ol>
<li>GDP從直接下載<code>國民生產毛額之處分</code></li>
<li>季(1980之後）</li>
<li>選<strong>全部的日期</strong></li>
<li>選<strong>全部的計價方式</strong></li>
<li>項目選<strong>GDP</strong></li>
<li>總類選<strong>原始值</strong></li>
<li>按繼續後，選<strong>從螢幕顯示Excel檔</strong></li>
<li>開啟後，<strong>另存新檔成csv檔</strong></li>
<li>開回<code>RStudio</code> 開始處理資料</li>
</ol>
<p>或是<code>ETL_file("GDP.txt")</code></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-44">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
</hgroup>
<article class = 'flexbox vcenter'>
<p><q>練習讀入與創建一個<code>GDP</code>的 data frame</q></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="quote" id="slide-45" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<article data-timings="">
<p><q>答案</q></p>
<pre><code class="r">GDP = read.table(file=ETL_file("GDP.txt"),sep=",",stringsAsFactors=F,header=F)
</code></pre>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="quote" id="slide-46" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<article data-timings="">
<p><q>輸入<code>View(GDP)</code>觀察<code>GDP</code>會發現怎麼前後有很多列的資料是不要的</q>
<img src = './resources/figures/R_ETL_2.png' ></img></p>
<h3>好亂，我想<code>整理</code>好這個data frome</h3>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-47" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>資料清理</h2>
</hgroup>
<article data-timings="">
<div style='float:left;width:38%' >
<h3>要處理的標的物有</h3>
<ol>
<li>去除前後<code>不相干</code>的資料列</li>
<li>轉換欄位的格式
<ul>
<li>將單位轉換，從<code>百萬元變成元</code></li>
<li>將不應該出現的<code>,</code>去除</li>
</ul></li>
<li>抽離<code>年份</code>與<code>季</code></li>
</ol>
</div>
<div style='float:right;width:58%'>
<p><img src = './resources/figures/R_ETL_1.png' ></img></p>
</div>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-48" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>去除前後不相干的資料列</h2>
</hgroup>
<article data-timings="">
<pre><code>GDP_part = GDP[5:136,]
</code></pre>
<h3>別忘了改上欄位名稱</h3>
<pre><code>colnames(GDP_part) = c("time","GDP","GDP_yoy","GDP_2006","GDP_2006_yoy",
"GDP_minus","GDP_minus_yoy")
</code></pre>
<p><img src = './resources/figures/R_ETL_GDP_1.png' ></img></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-49" style="background:; background-repeat:no-repeat; background-position:center; ">
<img src="assets/img/Taiwan-R-logo.png" class="logo fit100" />
<hgroup>
<h2>去除rownames</h2>
</hgroup>
<article data-timings="">
<pre><code>rownames(GDP_part) = NULL
View(GDP_part)
</code></pre>
<p>另外一個簡單的例子</p>
<pre><code>iris
iris_part <- iris[4:6,]
rownames(iris_part) <- c('a','c','d')
View(iris_part)
</code></pre>
</article>
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</slide>