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<title>Calculate a time weighted average concentration — twa • pfm</title>
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<h1>Calculate a time weighted average concentration</h1>
</div>
<p>The moving average is built only using the values in the past, so
the earliest possible time for the maximum in the time series returned
is after one window has passed.</p>
<pre class="usage"><span class='fu'>twa</span>(<span class='no'>x</span>, <span class='kw'>window</span> <span class='kw'>=</span> <span class='fl'>21</span>)
<span class='co'># S3 method for one_box</span>
<span class='fu'>twa</span>(<span class='no'>x</span>, <span class='kw'>window</span> <span class='kw'>=</span> <span class='fl'>21</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>An object of type <code><a href='one_box.html'>one_box</a></code></p></td>
</tr>
<tr>
<th>window</th>
<td><p>The size of the moving window</p></td>
</tr>
</table>
<h2 class="hasAnchor" id="see-also"><a class="anchor" href="#see-also"></a>See also</h2>
<p><code><a href='max_twa.html'>max_twa</a></code></p>
<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
<pre class="examples"><div class='input'><span class='no'>pred</span> <span class='kw'><-</span> <span class='fu'><a href='sawtooth.html'>sawtooth</a></span>(<span class='fu'><a href='one_box.html'>one_box</a></span>(<span class='fl'>10</span>),
<span class='kw'>applications</span> <span class='kw'>=</span> <span class='fu'>data.frame</span>(<span class='kw'>time</span> <span class='kw'>=</span> <span class='fu'>c</span>(<span class='fl'>0</span>, <span class='fl'>7</span>), <span class='kw'>amount</span> <span class='kw'>=</span> <span class='fu'>c</span>(<span class='fl'>1</span>, <span class='fl'>1</span>)))
<span class='fu'><a href='max_twa.html'>max_twa</a></span>(<span class='no'>pred</span>)</div><div class='output co'>#> $max
#> parent
#> 0.9537545
#>
#> $window_start
#> parent
#> 0
#>
#> $window_end
#> parent
#> 21
#> </div></pre>
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<li><a href="#arguments">Arguments</a></li>
<li><a href="#see-also">See also</a></li>
<li><a href="#examples">Examples</a></li>
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