e"], mri$ldl[mri$sex == "Male"])</code>.</p>
<p>Note that the default of <code>ttest</code> is to assume unequal
variances between groups, which we (the authors of this package) believe
to be the best choice in most scenarios. We also run two-sided tests by
default, but others can be specified, along with non-zero null
hypotheses, and tests at levels other than 0.95:</p>
<div class="sourceCode" id="cb8"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="fu"><a href="../referenc