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      <div class="page-header">
  <h1> Hockey-Stick kinetics </h1>
</div>

<div class="row">
  <div class="col-md-9">
    
    <p>Function describing two exponential decline functions with a break point
  between them.</p>
    

    <pre><span class='fu'>HS.solution</span>(<span class='no'>t</span>, <span class='no'>parent.0</span>, <span class='no'>k1</span>, <span class='no'>k2</span>, <span class='no'>tb</span>)</pre>
    
    <h2>Arguments</h2>
    <dl class="dl-horizontal">
      <dt>t</dt>
      <dd> Time. </dd>
      <dt>parent.0</dt>
      <dd> Starting value for the response variable at time zero. </dd>
      <dt>k1</dt>
      <dd> First kinetic constant. </dd>
      <dt>k2</dt>
      <dd> Second kinetic constant. </dd>
      <dt>tb</dt>
      <dd> Break point. Before this time, exponential decline according
    to <code>k1</code> is calculated, after this time, exponential decline proceeds
    according to <code>k2</code>. </dd>
    </dl>
    
    <div class="Value">
      <h2>Value</h2>

      <p>The value of the response variable at time <code>t</code>.</p>
    </div>

    <div class="References">
      <h2>References</h2>

      <p>FOCUS (2006) &#8220;Guidance Document on Estimating Persistence and
  Degradation Kinetics from Environmental Fate Studies on Pesticides in EU
  Registration&#8221; Report of the FOCUS Work Group on Degradation Kinetics,
  EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
  <a href = 'http://focus.jrc.ec.europa.eu/dk'>http://focus.jrc.ec.europa.eu/dk</a></p>
    </div>
    
    <h2 id="examples">Examples</h2>
    <pre class="examples"><div class='input'>  <span class='fu'>plot</span>(<span class='kw'>function</span>(<span class='no'>x</span>) <span class='fu'>HS.solution</span>(<span class='no'>x</span>, <span class='fl'>100</span>, <span class='fl'>2</span>, <span class='fl'>0.3</span>, <span class='fl'>0.5</span>), <span class='fl'>0</span>, <span class='fl'>2</span>, <span class='kw'>ylim</span><span class='kw'>=</span><span class='fu'>c</span>(<span class='fl'>0</span>,<span class='fl'>100</span>))</div><img src='unknown-2.png' alt='' width='540' height='400' /></pre>
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