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<title>The maximum time weighted average concentration for a moving window — max_twa • pfm</title>
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<h1>The maximum time weighted average concentration for a moving window</h1>
<small class="dont-index">Source: <a href='https://github.com/jranke/pfm/blob/master/R/twa.R'><code>R/twa.R</code></a></small>
<div class="hidden name"><code>max_twa.Rd</code></div>
</div>
<div class="ref-description">
<p>If you generate your time series using <code><a href='sawtooth.html'>sawtooth</a></code>,
you need to make sure that the length of the time series allows
for finding the maximum. It is therefore recommended to check this using
<code><a href='plot.one_box.html'>plot.one_box</a></code> using the window size for the argument
<code>max_twa</code>.</p>
</div>
<pre class="usage"><span class='fu'>max_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="details"><a class="anchor" href="#details"></a>Details</h2>
<p>The method working directly on fitted <code>mkinfit</code> objects uses the
equations given in the PEC soil section of the FOCUS guidance and is restricted
SFO, FOMC and DFOP models and to the parent compound</p>
<h2 class="hasAnchor" id="references"><a class="anchor" href="#references"></a>References</h2>
<p>FOCUS (2006) “Guidance Document on Estimating Persistence and
Degradation Kinetics from Environmental Fate Studies on Pesticides in EU
Registration” Report of the FOCUS Work Group on Degradation Kinetics,
EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
<a href='http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics'>http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics</a></p>
<h2 class="hasAnchor" id="see-also"><a class="anchor" href="#see-also"></a>See also</h2>
<div class='dont-index'><p><code><a href='twa.html'>twa</a></code></p></div>
<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'><a href='https://www.rdocumentation.org/packages/base/topics/data.frame'>data.frame</a></span>(<span class='kw'>time</span> <span class='kw'>=</span> <span class='fu'><a href='https://www.rdocumentation.org/packages/base/topics/c'>c</a></span>(<span class='fl'>0</span>, <span class='fl'>7</span>), <span class='kw'>amount</span> <span class='kw'>=</span> <span class='fu'><a href='https://www.rdocumentation.org/packages/base/topics/c'>c</a></span>(<span class='fl'>1</span>, <span class='fl'>1</span>)))
<span class='fu'>max_twa</span>(<span class='no'>pred</span>)</div><div class='output co'>#> $max
#> parent
#> 0.9537545
#>
#> $window_start
#> parent
#> 0
#>
#> $window_end
#> parent
#> 21
#> </div><div class='input'><span class='no'>pred_FOMC</span> <span class='kw'><-</span> <span class='fu'>mkinfit</span>(<span class='st'>"FOMC"</span>, <span class='no'>FOCUS_2006_C</span>, <span class='kw'>quiet</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>)
<span class='fu'>max_twa</span>(<span class='no'>pred_FOMC</span>)</div><div class='output co'>#> 21
#> 18.22124 </div></pre>
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<li><a href="#see-also">See also</a></li>
<li><a href="#examples">Examples</a></li>
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