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<h1>Evaluate parent kinetics using the NAFTA guidance</h1>
<div class="hidden name"><code>nafta.Rd</code></div>
</div>
<div class="ref-description">
<p>The function fits the SFO, IORE and DFOP models using
<code><a href='mmkin.html'>mmkin</a></code> and returns an object of class
<code>nafta</code> that has methods for printing and plotting.</p>
</div>
<pre class="usage">nafta(ds, title = NA, quiet = FALSE, …)</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>ds</th>
<td><p>A dataframe that must contain one variable called "time" with the time
values specified by the <code>time</code> argument, one column called "name" with
the grouping of the observed values, and finally one column of observed
values called "value".</p></td>
</tr>
<tr>
<th>title</th>
<td><p>Optional title of the dataset</p></td>
</tr>
<tr>
<th>quiet</th>
<td><p>Should the evaluation text be shown?</p></td>
</tr>
<tr>
<th>…</th>
<td><p>Further arguments passed to <code><a href='mmkin.html'>mmkin</a></code>.</p></td>
</tr>
</table>
<h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>
<p>An list of class <code>nafta</code>. The list element named "mmkin" is the
<code><a href='mmkin.html'>mmkin</a></code> object containing the fits of the three models.
The list element named "title" contains the title of the dataset used.
The list element "data" contains the dataset used in the fits.</p>
<h2 class="hasAnchor" id="source"><a class="anchor" href="#source"></a>Source</h2>
<p>NAFTA (2011) Guidance for evaluating and calculating degradation kinetics
in environmental media. NAFTA Technical Working Group on Pesticides
<a href='https://www.epa.gov/pesticide-science-and-assessing-pesticide-risks/guidance-evaluating-and-calculating-degradation'>https://www.epa.gov/pesticide-science-and-assessing-pesticide-risks/guidance-evaluating-and-calculating-degradation</a>
accessed 2019-02-22</p>
<p>US EPA (2015) Standard Operating Procedure for Using the NAFTA Guidance to
Calculate Representative Half-life Values and Characterizing Pesticide
Degradation
<a href='https://www.epa.gov/pesticide-science-and-assessing-pesticide-risks/standard-operating-procedure-using-nafta-guidance'>https://www.epa.gov/pesticide-science-and-assessing-pesticide-risks/standard-operating-procedure-using-nafta-guidance</a></p>
<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
<pre class="examples"><div class='input'> <span class='no'>nafta_evaluation</span> <span class='kw'><-</span> <span class='fu'>nafta</span>(<span class='no'>NAFTA_SOP_Appendix_D</span>, <span class='kw'>cores</span> <span class='kw'>=</span> <span class='fl'>1</span>)</div><div class='output co'>#> <span class='warning'>Warning: Could not calculate correlation; no covariance matrix</span></div><div class='output co'>#> <span class='warning'>Warning: Could not calculate correlation; no covariance matrix</span></div><div class='output co'>#> <span class='warning'>Warning: Could not calculate correlation; no covariance matrix</span></div><div class='output co'>#> <span class='message'>The SFO model is rejected as S_SFO is equal or higher than the critical value S_c</span></div><div class='output co'>#> <span class='message'>The representative half-life of the IORE model is longer than the one corresponding</span></div><div class='output co'>#> <span class='message'>to the terminal degradation rate found with the DFOP model.</span></div><div class='output co'>#> <span class='message'>The representative half-life obtained from the DFOP model may be used</span></div><div class='input'> <span class='fu'><a href='https://www.rdocumentation.org/packages/base/topics/print'>print</a></span>(<span class='no'>nafta_evaluation</span>)</div><div class='output co'>#> Sums of squares:
#> SFO IORE DFOP
#> 1378.6832 615.7730 517.8836
#>
#> Critical sum of squares for checking the SFO model:
#> [1] 717.4598
#>
#> Parameters:
#> $SFO
#> Estimate Pr(>t) Lower Upper
#> parent_0 83.7558 NA NA NA
#> k_parent_sink 0.0017 NA NA NA
#> sigma 8.7518 NA NA NA
#>
#> $IORE
#> Estimate Pr(>t) Lower Upper
#> parent_0 9.69e+01 NA NA NA
#> k__iore_parent_sink 8.40e-14 NA NA NA
#> N_parent 6.68e+00 NA NA NA
#> sigma 5.85e+00 NA NA NA
#>
#> $DFOP
#> Estimate Pr(>t) Lower Upper
#> parent_0 9.76e+01 NA NA NA
#> k1 4.24e-02 NA NA NA
#> k2 8.24e-04 NA NA NA
#> g 2.88e-01 NA NA NA
#> sigma 5.36e+00 NA NA NA
#>
#>
#> DTx values:
#> DT50 DT90 DT50_rep
#> SFO 407 1350 407
#> IORE 541 5190000 1560000
#> DFOP 429 2380 841
#>
#> Representative half-life:
#> [1] 841.41</div><div class='input'> <span class='fu'><a href='https://www.rdocumentation.org/packages/graphics/topics/plot'>plot</a></span>(<span class='no'>nafta_evaluation</span>)</div><div class='img'><img src='nafta-1.png' alt='' width='700' height='433' /></div></pre>
</div>
<div class="col-md-3 hidden-xs hidden-sm" id="sidebar">
<h2>Contents</h2>
<ul class="nav nav-pills nav-stacked">
<li><a href="#arguments">Arguments</a></li>
<li><a href="#value">Value</a></li>
<li><a href="#source">Source</a></li>
<li><a href="#examples">Examples</a></li>
</ul>
<h2>Author</h2>
<p>Johannes Ranke</p>
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