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<h1>Evaluate parent kinetics using the NAFTA guidance</h1>
<small class="dont-index">Source: <a href='https://github.com/jranke/mkin/blob/master/R/nafta.R'><code>R/nafta.R</code></a></small>
<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>
<p>Print nafta objects. The results for the three models are printed in the
order of increasing model complexity, i.e. SFO, then IORE, and finally DFOP.</p>
</div>
<pre class="usage"><span class='fu'>nafta</span><span class='op'>(</span><span class='va'>ds</span>, title <span class='op'>=</span> <span class='cn'>NA</span>, quiet <span class='op'>=</span> <span class='cn'>FALSE</span>, <span class='va'>...</span><span class='op'>)</span>
<span class='co'># S3 method for nafta</span>
<span class='fu'><a href='https://rdrr.io/r/base/print.html'>print</a></span><span class='op'>(</span><span class='va'>x</span>, quiet <span class='op'>=</span> <span class='cn'>TRUE</span>, digits <span class='op'>=</span> <span class='fl'>3</span>, <span class='va'>...</span><span class='op'>)</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>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> (not for the
printing method).</p></td>
</tr>
<tr>
<th>x</th>
<td><p>An <code>nafta</code> object.</p></td>
</tr>
<tr>
<th>digits</th>
<td><p>Number of digits to be used for printing parameters and
dissipation times.</p></td>
</tr>
</table>
<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="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="author"><a class="anchor" href="#author"></a>Author</h2>
<p>Johannes Ranke</p>
<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
<pre class="examples"><div class='input'>
<span class='va'>nafta_evaluation</span> <span class='op'><-</span> <span class='fu'>nafta</span><span class='op'>(</span><span class='va'>NAFTA_SOP_Appendix_D</span>, cores <span class='op'>=</span> <span class='fl'>1</span><span class='op'>)</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://rdrr.io/r/base/print.html'>print</a></span><span class='op'>(</span><span class='va'>nafta_evaluation</span><span class='op'>)</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 1.80e-14 77.18268 90.3288
#> k_parent 0.0017 7.43e-05 0.00112 0.0026
#> sigma 8.7518 1.22e-05 5.64278 11.8608
#>
#> $IORE
#> Estimate Pr(>t) Lower Upper
#> parent_0 9.69e+01 NA 8.88e+01 1.05e+02
#> k__iore_parent 8.40e-14 NA 1.79e-18 3.94e-09
#> N_parent 6.68e+00 NA 4.19e+00 9.17e+00
#> sigma 5.85e+00 NA 3.76e+00 7.94e+00
#>
#> $DFOP
#> Estimate Pr(>t) Lower Upper
#> parent_0 9.76e+01 1.94e-13 9.02e+01 1.05e+02
#> k1 4.24e-02 5.92e-03 2.03e-02 8.88e-02
#> k2 8.24e-04 6.48e-03 3.89e-04 1.75e-03
#> g 2.88e-01 2.47e-05 1.95e-01 4.03e-01
#> sigma 5.36e+00 2.22e-05 3.43e+00 7.30e+00
#>
#>
#> 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://rdrr.io/r/graphics/plot.default.html'>plot</a></span><span class='op'>(</span><span class='va'>nafta_evaluation</span><span class='op'>)</span>
</div><div class='img'><img src='nafta-1.png' alt='' width='700' height='433' /></div><div class='input'>
</div></pre>
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