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(This article was first published on <strong><a href="http://r-exercises.com/2016/07/22/start-here-to-learn-r/"> R-exercises</a></strong>, and kindly contributed to <a rel="nofollow" href="http://www.r-bloggers.com/">R-bloggers)</a> </div>
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<h2></h2>
<h2>Ready, set, go!</h2>
<p>On R-exercises, you will find hundreds of exercises that will help you to learn R. We’ve bundled them into exercise <i>sets</i>, where each set covers a specific concept or function. An exercise set typically contains about 10 exercises, progressing from easy to somewhat more difficult. In order to give you a full picture of all the amazing content on this website, we’ve categorized all sets into broader topics below.</p>
<p>If you’re completely new to R, we suggest you simply start with the first topic, “Simple manipulations; numbers and vectors”. Once you’ve managed to work through all exercise sets, from top to bottom, you should have a fair amount of knowledge of, and practical experience with, using R. Of course, those of you who are familiar with R already, can jump straight to any of the topics below.</p>
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<p>New exercise sets are added on a daily basis. Subscribe to R-exercises to receive daily updates by email.</p>
<p>Note: For future updates to the overview below, please have a look <a target="_blank" href="http://r-exercises.com/start-here-to-learn-r/">here</a>.</p>
<p>Have fun!</p>
<h2>Exercise sets by Topic</h2>
<p><strong>Vectors</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2015/10/09/vector-exercises/">Vectors</a></li>
<li><a target="_blank" href="http://r-exercises.com/2015/10/23/regular-sequences/">Regular sequences</a></li>
<li><a target="_blank" href="http://r-exercises.com/2015/11/25/logical-vectors-and-operators/">Logical vectors and operators</a></li>
<li><a target="_blank" href="http://r-exercises.com/2015/12/14/missing-values/">Missing Values</a></li>
<li><a target="_blank" href="http://r-exercises.com/2015/12/18/character-vector-exercises/">Character vector exercises</a></li>
<li><a target="_blank" href="http://r-exercises.com/2015/12/21/index-vectors/">Index vectors</a></li>
</ol>
<p><strong>Object modes and attributes</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2016/02/14/mode-exercises/">Mode exercises</a></li>
</ol>
<p><strong>Factors</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2015/12/28/factor-exercises/">Factor Exercises</a></li>
</ol>
<p><strong>Arrays and matrices</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2015/11/28/matrix-exercises/%20%E2%80%8E">Matrix exercises</a></li>
<li><a target="_blank" href="http://r-exercises.com/2015/12/01/array-exercises/">Array exercises</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/02/22/bind-exercises/">Bind exercises</a></li>
</ol>
<p><strong>Lists and dataframes</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2015/12/31/list-exercises/">List exercises</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/01/04/data-frame-exercises/">Data frame exercises</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/04/14/merging-dataframes-exercises/">Merging Dataframes Exercises</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/05/20/accessing-dataframe-objects-exercises/">Accessing Dataframe Objects Exercises</a></li>
</ol>
<p><strong>Importing data</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2016/01/07/reading-delimited-data/">Reading delimited data</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/01/11/scan-exercises/">Scan exercises</a></li>
</ol>
<p><strong>Tables</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2016/04/20/data-exploration-with-tables-exercises/">data exploration with table</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/04/26/complex-tables-exercises/">Complex Tables – Exercises</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/05/12/cross-tabulation-with-xtabs-exercises/">Cross Tabulation with Xtabs exercises</a></li>
</ol>
<p><strong>Data manipulation</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2016/03/01/get-your-stuff-in-order-exercises/">Get-your-stuff-in-order-exercises</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/06/16/summary-statistics-with-aggregate/">Summary Statistics With Aggregate()</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/07/06/data-shape-transformation-with-reshape/">Data Shape Transformation With Reshape()</a></li>
</ol>
<p><strong>Dates/times</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2016/07/14/as-date-exercises/">As.Date() Exercises</a></li>
</ol>
<p><strong>Probability distributions</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2016/03/23/lets-begin-with-something-sample/">Lets Begin with something sample</a></li>
</ol>
<p><strong>Loops and conditional execution</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2016/01/26/conditional-execution-exercises/">Conditional execution exercises</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/06/01/scripting-loops-in-r/">Scripting Loops in R</a></li>
</ol>
<p><strong>Functions</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2016/02/07/functions-exercises/">Functions exercises</a></li>
</ol>
<p><strong>Data visualization</strong></p>
<ol>
<li><a target="_blank" href="http://r-exercises.com/2016/03/11/start-plotting-data-3/">Start plotting data!</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/03/17/customize-scatterplot/">Customize a scatterplot exercises</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/03/24/graphics-parameters-exercises/">Graphics parameters exercises</a></li>
<li><a target="_blank" href="http://r-exercises.com/2016/04/06/3d-plotting-exercises/">3D plotting exercises</a></li>
</ol>
<p><strong>Contributed packages</strong></p>
<ol>
<li>Data Table – <em><a target="_blank" href="http://r-exercises.com/2016/03/21/data-table-exercises-keys-and-subsetting/">Data table exercises: keys and subsetting</a></em></li>
<li>Lattice – <em><a target="_blank" href="http://r-exercises.com/2016/04/30/lattice-exercises-part-1/">Lattice exercises – part 1</a></em></li>
<li>Lattice – <em><a target="_blank" href="http://r-exercises.com/2016/05/24/lattice-exercises-part-2/">Lattice exercises – part 2</a></em></li>
<li>Zoo – <em><a target="_blank" href="http://r-exercises.com/2016/05/30/zoo-time-series-exercises/">zoo time series exercises</a></em></li>
</ol>
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