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  <main id="main" class="col-md-9"><div class="page-header">
      <img src="../logo.png" class="logo" alt=""><h1>Obtain variance per group</h1>
      <small class="dont-index">Source: <a href="https://github.com/rempsyc/rempsyc/blob/HEAD/R/nice_var.R" class="external-link"><code>R/nice_var.R</code></a></small>
      <div class="d-none name"><code>nice_var.Rd</code></div>
    </div>

    <div class="ref-description section level2">
    <p>Obtain variance per group as well as check for
the rule of thumb of one group having variance four times
bigger than any of the other groups. Variance ratio is
calculated as Max / Min.</p>
    </div>

    <div class="section level2">
    <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">nice_var</span><span class="op">(</span><span class="va">data</span>, <span class="va">variable</span>, <span class="va">group</span>, criteria <span class="op">=</span> <span class="fl">4</span><span class="op">)</span></span></code></pre></div>
    </div>

    <div class="section level2">
    <h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>
    <dl><dt>data</dt>
<dd><p>The data frame</p></dd>


<dt>variable</dt>
<dd><p>The dependent variable to be plotted.</p></dd>


<dt>group</dt>
<dd><p>The group by which to plot the variable.</p></dd>


<dt>criteria</dt>
<dd><p>Desired threshold if one wants something
different than four times the variance.</p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    

<p>A dataframe, with the values of the selected variables for
each group, their max variance ratio (maximum variance divided by
the minimum variance), the selected decision criterion, and whether
the data are considered heteroscedastic according to the decision
criterion.</p>
    </div>
    <div class="section level2">
    <h2 id="see-also">See also<a class="anchor" aria-label="anchor" href="#see-also"></a></h2>
    <div class="dont-index"><p>Other functions useful in assumption testing:
<code><a href="nice_assumptions.html">nice_assumptions</a></code>, <code><a href="nice_density.html">nice_density</a></code>,
<code><a href="nice_normality.html">nice_normality</a></code>, <code><a href="nice_qq.html">nice_qq</a></code>,
<code><a href="nice_varplot.html">nice_varplot</a></code>. Tutorial:
<a href="https://rempsyc.remi-theriault.com/articles/assumptions">https://rempsyc.remi-theriault.com/articles/assumptions</a></p></div>
    </div>

    <div class="section level2">
    <h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="co"># Make the basic table</span></span></span>
<span class="r-in"><span><span class="fu">nice_var</span><span class="op">(</span></span></span>
<span class="r-in"><span>  data <span class="op">=</span> <span class="va">iris</span>,</span></span>
<span class="r-in"><span>  variable <span class="op">=</span> <span class="st">"Sepal.Length"</span>,</span></span>
<span class="r-in"><span>  group <span class="op">=</span> <span class="st">"Species"</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span>        Species Setosa Versicolor Virginica Variance.ratio Criteria</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 1 Sepal.Length  0.124      0.266     0.404            3.3        4</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>   Heteroscedastic</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 1           FALSE</span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># Try on multiple variables</span></span></span>
<span class="r-in"><span><span class="fu">nice_var</span><span class="op">(</span></span></span>
<span class="r-in"><span>  data <span class="op">=</span> <span class="va">iris</span>,</span></span>
<span class="r-in"><span>  variable <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/names.html" class="external-link">names</a></span><span class="op">(</span><span class="va">iris</span><span class="op">[</span><span class="fl">1</span><span class="op">:</span><span class="fl">4</span><span class="op">]</span><span class="op">)</span>,</span></span>
<span class="r-in"><span>  group <span class="op">=</span> <span class="st">"Species"</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span>        Species Setosa Versicolor Virginica Variance.ratio Criteria</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 1 Sepal.Length  0.124      0.266     0.404            3.3        4</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 2  Sepal.Width  0.144      0.098     0.104            1.5        4</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 3 Petal.Length  0.030      0.221     0.305           10.2        4</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 4  Petal.Width  0.011      0.039     0.075            6.8        4</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>   Heteroscedastic</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 1           FALSE</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 2           FALSE</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 3            TRUE</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 4            TRUE</span>
<span class="r-in"><span></span></span>
</code></pre></div>
    </div>
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