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<h1>Sail design matrix</h1>
<div class="hidden name"><code>design_sail.Rd</code></div>
</div>
<div class="ref-description">
<p>Create design matrix used in <code><a href='sail.html'>sail</a></code> function</p>
</div>
<pre class="usage"><span class='fu'>design_sail</span>(<span class='no'>x</span>, <span class='no'>e</span>, <span class='no'>expand</span>, <span class='no'>group</span>, <span class='no'>basis</span>, <span class='no'>nvars</span>, <span class='no'>vnames</span>, <span class='no'>center.x</span>, <span class='no'>center.e</span>)</pre>
<h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
<table class="ref-arguments">
<colgroup><col class="name" /><col class="desc" /></colgroup>
<tr>
<th>x</th>
<td><p>input matrix of dimension <code>n x p</code>, where <code>n</code> is the number
of subjects and p is number of X variables. Each row is an observation
vector. Can be a high-dimensional (n < p) matrix. Can be a user defined
design matrix of main effects only (without intercept) if
<code>expand=FALSE</code></p></td>
</tr>
<tr>
<th>e</th>
<td><p>exposure or environment vector. Must be a numeric vector. Factors
must be converted to numeric.</p></td>
</tr>
<tr>
<th>expand</th>
<td><p>should <code>basis</code> be applied to every column of <code>x</code>
(logical). Set to <code>FALSE</code> if you want a user defined main effects
design matrix. If <code>FALSE</code> the <code>group</code> membership argument must
also be supplied. Default: <code>TRUE</code>.</p></td>
</tr>
<tr>
<th>group</th>
<td><p>a vector of consecutive integers, starting from 1, describing
the grouping of the coefficients. Only required when <code>expand=FALSE</code>.</p></td>
</tr>
<tr>
<th>basis</th>
<td><p>user defined basis expansion function. This function will be
applied to every column in <code>x</code>. Specify <code>function(i) i</code> if no
expansion is desired. Default: <code>function(i) splines::bs(i, df = 5)</code>.</p></td>
</tr>
<tr>
<th>nvars</th>
<td><p>number of variables</p></td>
</tr>
<tr>
<th>vnames</th>
<td><p>variable names</p></td>
</tr>
<tr>
<th>center.x</th>
<td><p>should the columns of <code>x</code> (after basis expansion) be
centered (logical). Default: <code>TRUE</code>.</p></td>
</tr>
<tr>
<th>center.e</th>
<td><p>should exposure variable <code>e</code> be centered. Default:
<code>TRUE</code>.</p></td>
</tr>
</table>
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<h2>Contents</h2>
<ul class="nav nav-pills nav-stacked">
<li><a href="#arguments">Arguments</a></li>
</ul>
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<p>Developed by <a href='http://sahirbhatnagar.com'>Sahir Bhatnagar</a>, <a href='http://www.math.mcgill.ca/yyang/'>Yi Yang</a>, <a href='https://www.mcgill.ca/statisticalgenetics/'>Celia Greenwood</a>.</p>
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