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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, &#8230;)</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>&#8230;</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'>&lt;-</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'>#&gt; <span class='warning'>Warning: Calculation of the Jacobian failed for the cost function of the untransformed model.</span>
#&gt; <span class='warning'>No t-test results will be available</span></div><div class='output co'>#&gt; <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'>#&gt; <span class='message'>The representative half-life of the IORE model is longer than the one corresponding</span></div><div class='output co'>#&gt; <span class='message'>to the terminal degradation rate found with the DFOP model.</span></div><div class='output co'>#&gt; <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'>#&gt; Sums of squares:
#&gt;       SFO      IORE      DFOP 
#&gt; 1378.6832  615.7730  517.8836 
#&gt; 
#&gt; Critical sum of squares for checking the SFO model:
#&gt; [1] 717.4598
#&gt; 
#&gt; Parameters:
#&gt; $SFO
#&gt;                   Estimate       Pr(&gt;t)        Lower        Upper
#&gt; parent_0      83.755751519 8.076390e-15 76.928220975 90.583282063
#&gt; k_parent_sink  0.001703321 7.452357e-05  0.001108568  0.002617164
#&gt; 
#&gt; $IORE
#&gt;                         Estimate Pr(&gt;t)        Lower        Upper
#&gt; parent_0            9.685291e+01     NA 8.752855e+01 1.061773e+02
#&gt; k__iore_parent_sink 8.403401e-14     NA 1.092058e-19 6.466429e-08
#&gt; N_parent            6.684457e+00     NA 3.538510e+00 9.830404e+00
#&gt; 
#&gt; $DFOP
#&gt;              Estimate       Pr(&gt;t)        Lower        Upper
#&gt; parent_0 9.755655e+01 4.439930e-13 8.884447e+01 1.062686e+02
#&gt; k1       4.240633e-02 3.554769e-02 1.414189e-02 1.271610e-01
#&gt; k2       8.237928e-04 2.060933e-02 3.172784e-04 2.138925e-03
#&gt; g        2.881037e-01 1.313715e-04 1.783967e-01 4.299694e-01
#&gt; 
#&gt; 
#&gt; DTx values:
#&gt;      DT50    DT90 DT50_rep
#&gt; SFO   407    1350      407
#&gt; IORE  541 5190000  1560000
#&gt; DFOP  429    2380      841
#&gt; 
#&gt; Representative half-life:
#&gt; [1] 841.4096</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>
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  <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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