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<title>dplyr functions for a single dataset</title>
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<h1 class="title">dplyr functions for a single dataset</h1>
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<div id="TOC">
<ul>
<li><a href="#where-were-we">Where were we?</a><ul>
<li><a href="#load-dplyr-and-the-gapminder-data">Load <code>dplyr</code> and the Gapminder data</a></li>
</ul></li>
<li><a href="#use-mutate-to-add-new-variables">Use <code>mutate()</code> to add new variables</a></li>
<li><a href="#use-arrange-to-row-order-data-in-a-principled-way">Use <code>arrange()</code> to row-order data in a principled way</a></li>
<li><a href="#use-rename-to-rename-variables">Use <code>rename()</code> to rename variables</a></li>
<li><a href="#group_by-is-a-mighty-weapon"><code>group_by()</code> is a mighty weapon</a><ul>
<li><a href="#counting-things-up">Counting things up</a></li>
<li><a href="#general-summarization">General summarization</a></li>
<li><a href="#window-functions">Window functions</a></li>
<li><a href="#grand-finale">Grand Finale</a></li>
</ul></li>
<li><a href="#resources">Resources</a></li>
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<div id="where-were-we" class="section level3">
<h3>Where were we?</h3>
<p>In the <a href="block009_dplyr-intro.html">introduction to <code>plyr</code></a>, we used two very important verbs and an operator:</p>
<ul>
<li><code>filter()</code> for subsetting data row-wise</li>
<li><code>select()</code> for subsetting data variable- or column-wise</li>
<li>the pipe operator <code>%>%</code>, which feeds the LHS as the first argument to the expression on the RHS</li>
</ul>
<p>Here we explore other <code>dplyr</code> functions, especially more verbs, for working with a single dataset.</p>
<div id="load-dplyr-and-the-gapminder-data" class="section level4">
<h4>Load <code>dplyr</code> and the Gapminder data</h4>
<p>We use an excerpt of the Gapminder data and store it as a <code>tbl_df</code> object, basically an enhanced data.frame</p>
<pre class="r"><code>suppressPackageStartupMessages(library(dplyr))
library(gapminder)
gtbl <- gapminder %>%
tbl_df
gtbl %>%
glimpse</code></pre>
<pre><code>## Observations: 1,704
## Variables: 6
## $ country (fctr) Afghanistan, Afghanistan, Afghanistan, Afghanistan,...
## $ continent (fctr) Asia, Asia, Asia, Asia, Asia, Asia, Asia, Asia, Asi...
## $ year (dbl) 1952, 1957, 1962, 1967, 1972, 1977, 1982, 1987, 1992...
## $ lifeExp (dbl) 28.801, 30.332, 31.997, 34.020, 36.088, 38.438, 39.8...
## $ pop (dbl) 8425333, 9240934, 10267083, 11537966, 13079460, 1488...
## $ gdpPercap (dbl) 779.4453, 820.8530, 853.1007, 836.1971, 739.9811, 78...</code></pre>
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<div id="use-mutate-to-add-new-variables" class="section level3">
<h3>Use <code>mutate()</code> to add new variables</h3>
<p>Imagine we wanted to recover each country’s GDP. After all, the Gapminder data has a variable for population and GDP per capita. Let’s multiply them together.</p>
<pre class="r"><code>gtbl <- gtbl %>%
mutate(gdp = pop * gdpPercap)
gtbl %>%
glimpse</code></pre>
<pre><code>## Observations: 1,704
## Variables: 7
## $ country (fctr) Afghanistan, Afghanistan, Afghanistan, Afghanistan,...
## $ continent (fctr) Asia, Asia, Asia, Asia, Asia, Asia, Asia, Asia, Asi...
## $ year (dbl) 1952, 1957, 1962, 1967, 1972, 1977, 1982, 1987, 1992...
## $ lifeExp (dbl) 28.801, 30.332, 31.997, 34.020, 36.088, 38.438, 39.8...
## $ pop (dbl) 8425333, 9240934, 10267083, 11537966, 13079460, 1488...
## $ gdpPercap (dbl) 779.4453, 820.8530, 853.1007, 836.1971, 739.9811, 78...
## $ gdp (dbl) 6567086330, 7585448670, 8758855797, 9648014150, 9678...</code></pre>
<p>Hmmmm … those GDP numbers are almost uselessly large and abstract. Consider the <a href="http://fivethirtyeight.com/datalab/xkcd-randall-munroe-qanda-what-if/">advice of Randall Munroe of xkcd</a>: “One thing that bothers me is large numbers presented without context… ‘If I added a zero to this number, would the sentence containing it mean something different to me?’ If the answer is ‘no,’ maybe the number has no business being in the sentence in the first place.” Maybe it would be more meaningful to consumers of my tables and figures if I reported GDP per capita, <em>relative to some benchmark country</em>. Since Canada is my adopted home, I’ll go with that.</p>
<pre class="r"><code>just_canada <- gtbl %>%
filter(country == "Canada")
## this is a dangerous way to add this variable
## doing it this way so we don't get too fancy yet
gtbl <- gtbl %>%
mutate(canada = rep(just_canada$gdpPercap, nlevels(country)),
gdpPercapRel = gdpPercap / canada)
gtbl %>%
select(country, year, gdpPercap, canada, gdpPercapRel)</code></pre>
<pre><code>## Source: local data frame [1,704 x 5]
##
## country year gdpPercap canada gdpPercapRel
## (fctr) (dbl) (dbl) (dbl) (dbl)
## 1 Afghanistan 1952 779.4453 11367.16 0.06856992
## 2 Afghanistan 1957 820.8530 12489.95 0.06572108
## 3 Afghanistan 1962 853.1007 13462.49 0.06336874
## 4 Afghanistan 1967 836.1971 16076.59 0.05201335
## 5 Afghanistan 1972 739.9811 18970.57 0.03900679
## 6 Afghanistan 1977 786.1134 22090.88 0.03558542
## 7 Afghanistan 1982 978.0114 22898.79 0.04271018
## 8 Afghanistan 1987 852.3959 26626.52 0.03201305
## 9 Afghanistan 1992 649.3414 26342.88 0.02464959
## 10 Afghanistan 1997 635.3414 28954.93 0.02194243
## .. ... ... ... ... ...</code></pre>
<pre class="r"><code>gtbl %>%
select(gdpPercapRel) %>%
summary</code></pre>
<pre><code>## gdpPercapRel
## Min. :0.007236
## 1st Qu.:0.061648
## Median :0.171521
## Mean :0.326659
## 3rd Qu.:0.446564
## Max. :9.534690</code></pre>
<p>Note that, <code>mutate()</code> builds new variables sequentially so you can reference earlier ones (like <code>canada</code>) when defining later ones (like <code>gdpPercapRel</code>).</p>
<p>The relative GDP per capita numbers are, in general, well below 1. We see that most of the countries covered by this dataset have substantially lower GDP per capita, relative to Canada, across the entire time period.</p>
</div>
<div id="use-arrange-to-row-order-data-in-a-principled-way" class="section level3">
<h3>Use <code>arrange()</code> to row-order data in a principled way</h3>
<p>Imagine you wanted this data ordered by year then country, as opposed to by country then year.</p>
<pre class="r"><code>gtbl %>%
arrange(year, country)</code></pre>
<pre><code>## Source: local data frame [1,704 x 9]
##
## country continent year lifeExp pop gdpPercap gdp
## (fctr) (fctr) (dbl) (dbl) (dbl) (dbl) (dbl)
## 1 Afghanistan Asia 1952 28.801 8425333 779.4453 6567086330
## 2 Albania Europe 1952 55.230 1282697 1601.0561 2053669902
## 3 Algeria Africa 1952 43.077 9279525 2449.0082 22725632678
## 4 Angola Africa 1952 30.015 4232095 3520.6103 14899557133
## 5 Argentina Americas 1952 62.485 17876956 5911.3151 105676319105
## 6 Australia Oceania 1952 69.120 8691212 10039.5956 87256254102
## 7 Austria Europe 1952 66.800 6927772 6137.0765 42516266683
## 8 Bahrain Asia 1952 50.939 120447 9867.0848 1188460759
## 9 Bangladesh Asia 1952 37.484 46886859 684.2442 32082059995
## 10 Belgium Europe 1952 68.000 8730405 8343.1051 72838686716
## .. ... ... ... ... ... ... ...
## Variables not shown: canada (dbl), gdpPercapRel (dbl)</code></pre>
<p>Or maybe you want just the data from 2007, sorted on life expectancy?</p>
<pre class="r"><code>gtbl %>%
filter(year == 2007) %>%
arrange(lifeExp)</code></pre>
<pre><code>## Source: local data frame [142 x 9]
##
## country continent year lifeExp pop gdpPercap
## (fctr) (fctr) (dbl) (dbl) (dbl) (dbl)
## 1 Swaziland Africa 2007 39.613 1133066 4513.4806
## 2 Mozambique Africa 2007 42.082 19951656 823.6856
## 3 Zambia Africa 2007 42.384 11746035 1271.2116
## 4 Sierra Leone Africa 2007 42.568 6144562 862.5408
## 5 Lesotho Africa 2007 42.592 2012649 1569.3314
## 6 Angola Africa 2007 42.731 12420476 4797.2313
## 7 Zimbabwe Africa 2007 43.487 12311143 469.7093
## 8 Afghanistan Asia 2007 43.828 31889923 974.5803
## 9 Central African Republic Africa 2007 44.741 4369038 706.0165
## 10 Liberia Africa 2007 45.678 3193942 414.5073
## .. ... ... ... ... ... ...
## Variables not shown: gdp (dbl), canada (dbl), gdpPercapRel (dbl)</code></pre>
<p>Oh, you’d like to sort on life expectancy in __desc__ending order? Then use <code>desc()</code>.</p>
<pre class="r"><code>gtbl %>%
filter(year == 2007) %>%
arrange(desc(lifeExp))</code></pre>
<pre><code>## Source: local data frame [142 x 9]
##
## country continent year lifeExp pop gdpPercap
## (fctr) (fctr) (dbl) (dbl) (dbl) (dbl)
## 1 Japan Asia 2007 82.603 127467972 31656.07
## 2 Hong Kong, China Asia 2007 82.208 6980412 39724.98
## 3 Iceland Europe 2007 81.757 301931 36180.79
## 4 Switzerland Europe 2007 81.701 7554661 37506.42
## 5 Australia Oceania 2007 81.235 20434176 34435.37
## 6 Spain Europe 2007 80.941 40448191 28821.06
## 7 Sweden Europe 2007 80.884 9031088 33859.75
## 8 Israel Asia 2007 80.745 6426679 25523.28
## 9 France Europe 2007 80.657 61083916 30470.02
## 10 Canada Americas 2007 80.653 33390141 36319.24
## .. ... ... ... ... ... ...
## Variables not shown: gdp (dbl), canada (dbl), gdpPercapRel (dbl)</code></pre>
<p>I advise that your analyses NEVER rely on rows or variables being in a specific order. But it’s still true that human beings write the code and the interactive development process can be much nicer if you reorder the rows of your data as you go along. Also, once you are preparing tables for human eyeballs, it is imperative that you step up and take control of row order.</p>
</div>
<div id="use-rename-to-rename-variables" class="section level3">
<h3>Use <code>rename()</code> to rename variables</h3>
<p>When I first cleaned this Gapminder excerpt, I was a <a href="http://en.wikipedia.org/wiki/CamelCase"><code>camelCase</code></a> person, but now I’m all about <a href="http://en.wikipedia.org/wiki/Snake_case"><code>snake_case</code></a>. So I am vexed by the variable names I chose when I cleaned this data years ago. Let’s rename some variables!</p>
<pre class="r"><code>gtbl %>%
rename(life_exp = lifeExp,
gdp_percap = gdpPercap,
gdp_percap_rel = gdpPercapRel)</code></pre>
<pre><code>## Source: local data frame [1,704 x 9]
##
## country continent year life_exp pop gdp_percap gdp
## (fctr) (fctr) (dbl) (dbl) (dbl) (dbl) (dbl)
## 1 Afghanistan Asia 1952 28.801 8425333 779.4453 6567086330
## 2 Afghanistan Asia 1957 30.332 9240934 820.8530 7585448670
## 3 Afghanistan Asia 1962 31.997 10267083 853.1007 8758855797
## 4 Afghanistan Asia 1967 34.020 11537966 836.1971 9648014150
## 5 Afghanistan Asia 1972 36.088 13079460 739.9811 9678553274
## 6 Afghanistan Asia 1977 38.438 14880372 786.1134 11697659231
## 7 Afghanistan Asia 1982 39.854 12881816 978.0114 12598563401
## 8 Afghanistan Asia 1987 40.822 13867957 852.3959 11820990309
## 9 Afghanistan Asia 1992 41.674 16317921 649.3414 10595901589
## 10 Afghanistan Asia 1997 41.763 22227415 635.3414 14121995875
## .. ... ... ... ... ... ... ...
## Variables not shown: canada (dbl), gdp_percap_rel (dbl)</code></pre>
<p>I did NOT assign the post-rename object back to <code>gtbl</code> because that would make the chunks in this tutorial harder to copy/paste and run out of order. In real life, I would probably assign this back to <code>gtbl</code>, in a data preparation script, and proceed with the new variable names.</p>
</div>
<div id="group_by-is-a-mighty-weapon" class="section level3">
<h3><code>group_by()</code> is a mighty weapon</h3>
<p>I have found <del>friends and family</del> collaborators love to ask seemingly innocuous questions like, “which country experienced the sharpest 5-year drop in life expectancy?”. In fact, that is a totally natural question to ask. But if you are using a language that doesn’t know about data, it’s an incredibly annoying question to answer.</p>
<p><code>dplyr</code> offers powerful tools to solve this class of problem.</p>
<ul>
<li><code>group_by()</code> adds extra structure to your dataset – grouping information – which lays the groundwork for computations within the groups.</li>
<li><code>summarize()</code> takes a dataset with <span class="math inline">\(n\)</span> observations, computes requested summaries, and returns a dataset with 1 observation.</li>
<li>window functions take a dataset with <span class="math inline">\(n\)</span> observations and return a dataset with <span class="math inline">\(n\)</span> observations.</li>
<li><code>do()</code> is the most general function you will use in a grouped data situation.</li>
</ul>
<p>Combined with the verbs you already know, these new tools allow you to solve an extremely diverse set of problems with relative ease.</p>
<div id="counting-things-up" class="section level4">
<h4>Counting things up</h4>
<p>Let’s start with simple counting. How many observations do we have per continent?</p>
<pre class="r"><code>gtbl %>%
group_by(continent) %>%
summarize(n_obs = n())</code></pre>
<pre><code>## Source: local data frame [5 x 2]
##
## continent n_obs
## (fctr) (int)
## 1 Africa 624
## 2 Americas 300
## 3 Asia 396
## 4 Europe 360
## 5 Oceania 24</code></pre>
<p>The <code>tally()</code> function is a convenience function for this sort of thing.</p>
<pre class="r"><code>gtbl %>%
group_by(continent) %>%
tally</code></pre>
<pre><code>## Source: local data frame [5 x 2]
##
## continent n
## (fctr) (int)
## 1 Africa 624
## 2 Americas 300
## 3 Asia 396
## 4 Europe 360
## 5 Oceania 24</code></pre>
<p>What if we wanted to add the number of unique countries for each continent?</p>
<pre class="r"><code>gtbl %>%
group_by(continent) %>%
summarize(n_obs = n(),
n_countries = n_distinct(country))</code></pre>
<pre><code>## Source: local data frame [5 x 3]
##
## continent n_obs n_countries
## (fctr) (int) (int)
## 1 Africa 624 52
## 2 Americas 300 25
## 3 Asia 396 33
## 4 Europe 360 30
## 5 Oceania 24 2</code></pre>
</div>
<div id="general-summarization" class="section level4">
<h4>General summarization</h4>
<p>The functions you’ll apply within <code>summarize()</code> include classical statistical summaries, like <code>mean()</code>, <code>median()</code>, <code>sd()</code>, and <code>IQR</code>. Remember they are functions that take <span class="math inline">\(n\)</span> inputs and distill them down into 1 output.</p>
<p>Although this may be statistically ill-advised, let’s compute the average life expectancy by continent.</p>
<pre class="r"><code>gtbl %>%
group_by(continent) %>%
summarize(avg_lifeExp = mean(lifeExp))</code></pre>
<pre><code>## Source: local data frame [5 x 2]
##
## continent avg_lifeExp
## (fctr) (dbl)
## 1 Africa 48.86533
## 2 Americas 64.65874
## 3 Asia 60.06490
## 4 Europe 71.90369
## 5 Oceania 74.32621</code></pre>
<p><code>summarize_each()</code> applies the same summary function(s) to multiple variables. Let’s compute average and median life expectancy and GDP per capita by continent by year … but only for 1952 and 2007.</p>
<pre class="r"><code>gtbl %>%
filter(year %in% c(1952, 2007)) %>%
group_by(continent, year) %>%
summarise_each(funs(mean, median), lifeExp, gdpPercap)</code></pre>
<pre><code>## Source: local data frame [10 x 6]
## Groups: continent [?]
##
## continent year lifeExp_mean gdpPercap_mean lifeExp_median
## (fctr) (dbl) (dbl) (dbl) (dbl)
## 1 Africa 1952 39.13550 1252.572 38.8330
## 2 Africa 2007 54.80604 3089.033 52.9265
## 3 Americas 1952 53.27984 4079.063 54.7450
## 4 Americas 2007 73.60812 11003.032 72.8990
## 5 Asia 1952 46.31439 5195.484 44.8690
## 6 Asia 2007 70.72848 12473.027 72.3960
## 7 Europe 1952 64.40850 5661.057 65.9000
## 8 Europe 2007 77.64860 25054.482 78.6085
## 9 Oceania 1952 69.25500 10298.086 69.2550
## 10 Oceania 2007 80.71950 29810.188 80.7195
## Variables not shown: gdpPercap_median (dbl)</code></pre>
<p>Let’s focus just on Asia. What are the minimum and maximum life expectancies seen by year?</p>
<pre class="r"><code>gtbl %>%
filter(continent == "Asia") %>%
group_by(year) %>%
summarize(min_lifeExp = min(lifeExp), max_lifeExp = max(lifeExp))</code></pre>
<pre><code>## Source: local data frame [12 x 3]
##
## year min_lifeExp max_lifeExp
## (dbl) (dbl) (dbl)
## 1 1952 28.801 65.390
## 2 1957 30.332 67.840
## 3 1962 31.997 69.390
## 4 1967 34.020 71.430
## 5 1972 36.088 73.420
## 6 1977 31.220 75.380
## 7 1982 39.854 77.110
## 8 1987 40.822 78.670
## 9 1992 41.674 79.360
## 10 1997 41.763 80.690
## 11 2002 42.129 82.000
## 12 2007 43.828 82.603</code></pre>
<p>Of course it would be much more interesting to see <em>which</em> country contributed these extreme observations. Is the minimum (maximum) always coming from the same country? That’s where window functions come in.</p>
</div>
<div id="window-functions" class="section level4">
<h4>Window functions</h4>
<p>Recall that window functions take <span class="math inline">\(n\)</span> inputs and give back <span class="math inline">\(n\)</span> outputs. Here we use window functions based on ranks and offsets.</p>
<p>Let’s revisit the worst and best life expectancies in Asia over time, but retaining info about <em>which</em> country contributes these extreme values.</p>
<pre class="r"><code>gtbl %>%
filter(continent == "Asia") %>%
select(year, country, lifeExp) %>%
arrange(year) %>%
group_by(year) %>%
filter(min_rank(desc(lifeExp)) < 2 | min_rank(lifeExp) < 2)</code></pre>
<pre><code>## Source: local data frame [24 x 3]
## Groups: year [12]
##
## year country lifeExp
## (dbl) (fctr) (dbl)
## 1 1952 Afghanistan 28.801
## 2 1952 Israel 65.390
## 3 1957 Afghanistan 30.332
## 4 1957 Israel 67.840
## 5 1962 Afghanistan 31.997
## 6 1962 Israel 69.390
## 7 1967 Afghanistan 34.020
## 8 1967 Japan 71.430
## 9 1972 Afghanistan 36.088
## 10 1972 Japan 73.420
## .. ... ... ...</code></pre>
<p>We see that (min = Agfhanistan, max = Japan) is the most frequent result, but Cambodia and Israel pop up at least once each as the min or max, respectively. That table should make you impatient for our upcoming work on tidying and reshaping data! Wouldn’t it be nice to have one row per year?</p>
<p>How did that actually work? First, I store and view the result including everything but the last <code>filter()</code> statement. All of these operations are familiar.</p>
<pre class="r"><code>asia <- gtbl %>%
filter(continent == "Asia") %>%
select(year, country, lifeExp) %>%
arrange(year) %>%
group_by(year)
asia</code></pre>
<pre><code>## Source: local data frame [396 x 3]
## Groups: year [12]
##
## year country lifeExp
## (dbl) (fctr) (dbl)
## 1 1952 Afghanistan 28.801
## 2 1952 Bahrain 50.939
## 3 1952 Bangladesh 37.484
## 4 1952 Cambodia 39.417
## 5 1952 China 44.000
## 6 1952 Hong Kong, China 60.960
## 7 1952 India 37.373
## 8 1952 Indonesia 37.468
## 9 1952 Iran 44.869
## 10 1952 Iraq 45.320
## .. ... ... ...</code></pre>
<p>Now we apply a window function – <code>min_rank()</code>. Since <code>asia</code> is grouped by year, <code>min_rank()</code> operates within mini-datasets, each for a specific year. Applied to the variable <code>lifeExp</code>, <code>min_rank()</code> returns the rank of each country’s observed life expectancy. FYI, the <code>min</code> part just specifies how ties are broken. Here is an explicit peek at these within-year life expectancy ranks, in both the (default) ascending and descending order.</p>
<pre class="r"><code>asia %>%
mutate(le_rank = min_rank(lifeExp),
le_desc_rank = min_rank(desc(lifeExp)))</code></pre>
<pre><code>## Source: local data frame [396 x 5]
## Groups: year [12]
##
## year country lifeExp le_rank le_desc_rank
## (dbl) (fctr) (dbl) (int) (int)
## 1 1952 Afghanistan 28.801 1 33
## 2 1952 Bahrain 50.939 25 9
## 3 1952 Bangladesh 37.484 7 27
## 4 1952 Cambodia 39.417 9 25
## 5 1952 China 44.000 16 18
## 6 1952 Hong Kong, China 60.960 31 3
## 7 1952 India 37.373 5 29
## 8 1952 Indonesia 37.468 6 28
## 9 1952 Iran 44.869 17 17
## 10 1952 Iraq 45.320 18 16
## .. ... ... ... ... ...</code></pre>
<p>You can understand the original <code>filter()</code> statement now:</p>
<pre class="r"><code>filter(min_rank(desc(lifeExp)) < 2 | min_rank(lifeExp) < 2)</code></pre>
<p>These two sets of ranks are formed, within year group, and <code>filter()</code> retains rows with rank less than 2, which means … the row with rank = 1. Since we do for ascending and descending ranks, we get both the min and the max.</p>
<p>If we had wanted just the min OR the max, an alternative approach using <code>top_n()</code> would have worked.</p>
<pre class="r"><code>gtbl %>%
filter(continent == "Asia") %>%
select(year, country, lifeExp) %>%
arrange(year) %>%
group_by(year) %>%
#top_n(1) ## gets the min
top_n(1, desc(lifeExp)) ## gets the max</code></pre>
<pre><code>## Source: local data frame [12 x 3]
## Groups: year [12]
##
## year country lifeExp
## (dbl) (fctr) (dbl)
## 1 1952 Afghanistan 28.801
## 2 1957 Afghanistan 30.332
## 3 1962 Afghanistan 31.997
## 4 1967 Afghanistan 34.020
## 5 1972 Afghanistan 36.088
## 6 1977 Cambodia 31.220
## 7 1982 Afghanistan 39.854
## 8 1987 Afghanistan 40.822
## 9 1992 Afghanistan 41.674
## 10 1997 Afghanistan 41.763
## 11 2002 Afghanistan 42.129
## 12 2007 Afghanistan 43.828</code></pre>
</div>
<div id="grand-finale" class="section level4">
<h4>Grand Finale</h4>
<p>So let’s answer that “simple” question: which country experienced the sharpest 5-year drop in life expectancy? Recall that this excerpt of the Gapminder data only has data every five years, e.g. for 1952, 1957, etc. So this really means looking at life expectancy changes between adjacent timepoints.</p>
<p>At this point, that’s just too easy, so let’s do it by continent while we’re at it.</p>
<pre class="r"><code>gtbl %>%
group_by(continent, country) %>%
select(country, year, continent, lifeExp) %>%
mutate(le_delta = lifeExp - lag(lifeExp)) %>%
summarize(worst_le_delta = min(le_delta, na.rm = TRUE)) %>%
filter(min_rank(worst_le_delta) < 2) %>%
arrange(worst_le_delta)</code></pre>
<pre><code>## Source: local data frame [5 x 3]
## Groups: continent [5]
##
## continent country worst_le_delta
## (fctr) (fctr) (dbl)
## 1 Africa Rwanda -20.421
## 2 Americas El Salvador -1.511
## 3 Asia Cambodia -9.097
## 4 Europe Montenegro -1.464
## 5 Oceania Australia 0.170</code></pre>
<p>Ponder that for a while. The subject matter and the code. Mostly you’re seeing what genocide looks like in dry statistics on average life expectancy.</p>
<p>Break the code into pieces, starting at the top, and inspect the intermediate results. That’s certainly how I was able to <em>write</em> such a thing. These commands do not <a href="http://tinyurl.com/athenaforehead">leap fully formed out of anyone’s forehead</a> – they are built up gradually, with lots of errors and refinements along the way. I’m not even sure it’s a great idea to do so much manipulation in one fell swoop. Is the statement above really hard for you to read? If yes, then by all means break it into pieces and make some intermediate objects. Your code should be easy to write and read when you’re done.</p>
<p>In later tutorials, we’ll explore more of <code>dplyr</code>, such as operations based on two datasets.</p>
</div>
</div>
<div id="resources" class="section level3">
<h3>Resources</h3>
<p><code>dplyr</code> official stuff</p>
<ul>
<li>package home <a href="http://cran.r-project.org/web/packages/dplyr/index.html">on CRAN</a>
<ul>
<li>note there are several vignettes, with the <a href="http://cran.r-project.org/web/packages/dplyr/vignettes/introduction.html">introduction</a> being the most relevant right now</li>
<li>the <a href="http://cran.rstudio.com/web/packages/dplyr/vignettes/window-functions.html">one on window functions</a> will also be interesting to you now</li>
</ul></li>
<li>development home <a href="https://github.com/hadley/dplyr">on GitHub</a></li>
<li><a href="https://www.dropbox.com/sh/i8qnluwmuieicxc/AAAgt9tIKoIm7WZKIyK25lh6a">tutorial HW delivered</a> (note this links to a DropBox folder) at useR! 2014 conference</li>
</ul>
<p><a href="https://www.rstudio.com/wp-content/uploads/2015/02/data-wrangling-cheatsheet.pdf?version=0.99.687&mode=desktop">RStudio <code>dplyr</code> and <code>tidyr</code> cheatsheet</a>. Remember you can get to these via <em>Help > Cheatsheets.</em></p>
<p><a href="https://github.com/tjmahr/MadR_Pipelines">Excellent slides</a> on pipelines and <code>dplyr</code> by TJ Mahr, talk given to the Madison R Users Group.</p>
<p>Blog post <a href="http://www.dataschool.io/dplyr-tutorial-for-faster-data-manipulation-in-r/">Hands-on dplyr tutorial for faster data manipulation in R</a> by Data School, that includes a link to an R Markdown document and links to videos</p>
<p><a href="bit001_dplyr-cheatsheet.html">Cheatsheet</a> I made for <code>dplyr</code> join functions (not relevant yet but soon)</p>
</div>
<div class="footer">
This work is licensed under the <a href="http://creativecommons.org/licenses/by-nc/3.0/">CC BY-NC 3.0 Creative Commons License</a>.
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