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<!doctype html> <html lang=en > <meta charset=UTF-8 > <meta name=viewport content="width=device-width, initial-scale=1"> <link rel=stylesheet href="/MLJTutorials/libs/highlight/github.min.css"> <link rel=stylesheet href="/MLJTutorials/css/franklin.css"> <link rel=stylesheet href="/MLJTutorials/css/pure.css"> <link rel=stylesheet href="/MLJTutorials/css/side-menu.css"> <link rel=stylesheet href="/MLJTutorials/css/extra.css"> <title>Handling categorical data</title> <script src="/MLJTutorials/libs/lunr/lunr.min.js"></script> <script src="/MLJTutorials/libs/lunr/lunr_index.js"></script> <script src="/MLJTutorials/libs/lunr/lunrclient.min.js"></script> <div id=layout > <a href="#menu" id=menuLink class=menu-link ><span></span></a> <div id=menu > <div class=pure-menu > <a href="/MLJTutorials/" id=menu-logo-link > <div class=menu-logo > <img id=menu-logo alt="MLJ Logo" src="/MLJTutorials/assets/infra/MLJLogo2.svg" /> <p><strong>MLJ Tutorials</strong></p> </div> </a> <form id=lunrSearchForm name=lunrSearchForm > <input class=search-input name=q placeholder="Enter search term" type=text > <input type=submit value=Search formaction="/MLJTutorials/search/index.html" style="visibility:hidden"> </form> <ul class=pure-menu-list > <li class="pure-menu-item pure-menu-top-item "><a href="/MLJTutorials/" class=pure-menu-link ><strong>Home</strong></a> <li class=pure-menu-sublist-title ><strong>Data basics</strong> <ul class=pure-menu-sublist > <li class="pure-menu-item "><a href="/MLJTutorials/data/loading/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Loading data</a> <li class="pure-menu-item "><a href="/MLJTutorials/data/dataframe/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Data Frames</a> <li class="pure-menu-item "><a href="/MLJTutorials/data/categorical/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Categorical Arrays</a> <li class="pure-menu-item "><a href="/MLJTutorials/data/scitype/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Scientific Type</a> </ul> <li class=pure-menu-sublist-title ><strong>Getting started</strong> <ul class=pure-menu-sublist > <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/choosing-a-model/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Choosing a model</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/fit-and-predict/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Fit, predict, transform</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/model-tuning/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Model tuning</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/ensembles/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Ensembles</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/ensembles-2/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Ensembles (2)</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/ensembles-3/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Ensembles (3)</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/composing-models/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Composing models</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/learning-networks/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Learning networks</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/learning-networks-2/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Learning networks (2)</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/stacking/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Stacking</a> </ul> <li class=pure-menu-sublist-title ><strong>Intro to Stats Learning</strong> <ul class=pure-menu-sublist id=isl> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-2/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 2</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-3/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 3</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-4/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 4</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-5/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 5</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-6b/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 6b</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-8/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 8</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-9/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 9</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-10/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 10</a> </ul> <li class=pure-menu-sublist-title ><strong>End to end examples</strong> <ul class=pure-menu-sublist id=e2e> <li class="pure-menu-item "><a href="/MLJTutorials/end-to-end/AMES/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> AMES</a> <li class="pure-menu-item "><a href="/MLJTutorials/end-to-end/wine/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Wine</a> <li class="pure-menu-item "><a href="/MLJTutorials/end-to-end/crabs-xgb/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Crabs (XGB)</a> <li class="pure-menu-item "><a href="/MLJTutorials/end-to-end/horse/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Horse</a> <li class="pure-menu-item "><a href="/MLJTutorials/end-to-end/HouseKingCounty/index.html" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> King County Houses</a> </ul> </ul> </div> </div> <div id=main > <div class=franklin-content > <h1 id=handling_categorical_data ><a href="#handling_categorical_data">Handling categorical data</a></h1> <em>Download the</em> <a href="https://raw.githubusercontent.com/alan-turing-institute/MLJTutorials/gh-pages/generated/notebooks/D0-categorical.ipynb" target=_blank ><em>notebook</em></a>, <em>the</em> <a href="https://raw.githubusercontent.com/alan-turing-institute/MLJTutorials/gh-pages/generated/scripts/D0-categorical-raw.jl" target=_blank ><em>raw script</em></a>, <em>or the</em> <a href="https://raw.githubusercontent.com/alan-turing-institute/MLJTutorials/gh-pages/generated/scripts/D0-categorical.jl" target=_blank ><em>annotated script</em></a> <em>for this tutorial &#40;right-click on the link and save&#41;.</em> <div class=franklin-toc ><ol><li><a href="#defining_a_categorical_vector">Defining a categorical vector</a><li><a href="#working_with_categoricals">Working with categoricals</a><ol><li><a href="#ordered_categoricals">Ordered categoricals</a><li><a href="#missing_values">Missing values</a></ol></ol></div>This tutorial follows loosely <a href="https://juliadata.github.io/CategoricalArrays.jl/latest/using.html">the docs</a>.</p> <h2 id=defining_a_categorical_vector ><a href="#defining_a_categorical_vector">Defining a categorical vector</a></h2> <pre><code class="julia hljs"><span class=hljs-keyword >using</span> CategoricalArrays
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<!doctype html> <html lang=en > <meta charset=UTF-8 > <meta name=viewport content="width=device-width, initial-scale=1"> <link rel=stylesheet href="/MLJTutorials/libs/highlight/github.min.css"> <link rel=stylesheet href="/MLJTutorials/css/franklin.css"> <link rel=stylesheet href="/MLJTutorials/css/pure.css"> <link rel=stylesheet href="/MLJTutorials/css/side-menu.css"> <link rel=stylesheet href="/MLJTutorials/css/extra.css"> <title>Handling categorical data</title> <script src="/MLJTutorials/libs/lunr/lunr.min.js"></script> <script src="/MLJTutorials/libs/lunr/lunr_index.js"></script> <script src="/MLJTutorials/libs/lunr/lunrclient.min.js"></script> <div id=layout > <a href="#menu" id=menuLink class=menu-link ><span></span></a> <div id=menu > <div class=pure-menu > <a href="/MLJTutorials/" id=menu-logo-link > <div class=menu-logo > <img id=menu-logo alt="MLJ Logo" src="/MLJTutorials/assets/infra/MLJLogo2.svg" /> <p><strong>MLJ Tutorials</strong></p> </div> </a> <form id=lunrSearchForm name=lunrSearchForm > <input class=search-input name=q placeholder="Enter search term" type=text > <input type=submit value=Search formaction="/MLJTutorials/search/index.html" style="visibility:hidden"> </form> <ul class=pure-menu-list > <li class="pure-menu-item pure-menu-top-item "><a href="/MLJTutorials/" class=pure-menu-link ><strong>Home</strong></a> <li class=pure-menu-sublist-title ><strong>Data basics</strong> <ul class=pure-menu-sublist > <li class="pure-menu-item "><a href="/MLJTutorials/data/loading/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Loading data</a> <li class="pure-menu-item "><a href="/MLJTutorials/data/dataframe/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Data Frames</a> <li class="pure-menu-item "><a href="/MLJTutorials/data/categorical/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Categorical Arrays</a> <li class="pure-menu-item "><a href="/MLJTutorials/data/scitype/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Scientific Type</a> </ul> <li class=pure-menu-sublist-title ><strong>Getting started</strong> <ul class=pure-menu-sublist > <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/choosing-a-model/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Choosing a model</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/fit-and-predict/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Fit, predict, transform</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/model-tuning/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Model tuning</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/ensembles/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Ensembles</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/ensembles-2/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Ensembles (2)</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/ensembles-3/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Ensembles (3)</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/composing-models/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Composing models</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/learning-networks/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Learning networks</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/learning-networks-2/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Learning networks (2)</a> <li class="pure-menu-item "><a href="/MLJTutorials/getting-started/stacking/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Stacking</a> </ul> <li class=pure-menu-sublist-title ><strong>Intro to Stats Learning</strong> <ul class=pure-menu-sublist id=isl> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-2/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 2</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-3/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 3</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-4/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 4</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-5/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 5</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-6b/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 6b</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-8/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 8</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-9/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 9</a> <li class="pure-menu-item "><a href="/MLJTutorials/isl/lab-10/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Lab 10</a> </ul> <li class=pure-menu-sublist-title ><strong>End to end examples</strong> <ul class=pure-menu-sublist id=e2e> <li class="pure-menu-item "><a href="/MLJTutorials/end-to-end/AMES/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> AMES</a> <li class="pure-menu-item "><a href="/MLJTutorials/end-to-end/wine/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Wine</a> <li class="pure-menu-item "><a href="/MLJTutorials/end-to-end/crabs-xgb/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Crabs (XGB)</a> <li class="pure-menu-item "><a href="/MLJTutorials/end-to-end/horse/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> Horse</a> <li class="pure-menu-item "><a href="/MLJTutorials/end-to-end/HouseKingCounty/" class=pure-menu-link ><span style="padding-right:0.5rem;">•</span> King County Houses</a> </ul> </ul> </div> </div> <div id=main > <div class=franklin-content > <h1 id=handling_categorical_data ><a href="#handling_categorical_data">Handling categorical data</a></h1> <em>Download the</em> <a href="https://raw.githubusercontent.com/alan-turing-institute/MLJTutorials/gh-pages/generated/notebooks/D0-categorical.ipynb" target=_blank ><em>notebook</em></a>, <em>the</em> <a href="https://raw.githubusercontent.com/alan-turing-institute/MLJTutorials/gh-pages/generated/scripts/D0-categorical-raw.jl" target=_blank ><em>raw script</em></a>, <em>or the</em> <a href="https://raw.githubusercontent.com/alan-turing-institute/MLJTutorials/gh-pages/generated/scripts/D0-categorical.jl" target=_blank ><em>annotated script</em></a> <em>for this tutorial &#40;right-click on the link and save&#41;.</em> <div class=franklin-toc ><ol><li><a href="#defining_a_categorical_vector">Defining a categorical vector</a><li><a href="#working_with_categoricals">Working with categoricals</a><ol><li><a href="#ordered_categoricals">Ordered categoricals</a><li><a href="#missing_values">Missing values</a></ol></ol></div>This tutorial follows loosely <a href="https://juliadata.github.io/CategoricalArrays.jl/latest/using.html">the docs</a>.</p> <h2 id=defining_a_categorical_vector ><a href="#defining_a_categorical_vector">Defining a categorical vector</a></h2> <pre><code class="julia hljs"><span class=hljs-keyword >using</span> CategoricalArrays
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v = categorical([<span class=hljs-string >"AA"</span>, <span class=hljs-string >"BB"</span>, <span class=hljs-string >"CC"</span>, <span class=hljs-string >"AA"</span>, <span class=hljs-string >"BB"</span>, <span class=hljs-string >"CC"</span>])</code></pre><pre><code class="plaintext hljs">6-element CategoricalArrays.CategoricalArray{String,1,UInt32}:
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"AA"

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