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<table width="100%" summary="page for SurvFn.in.4p"><tr><td>SurvFn.in.4p</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>The intrinsic cumulative survival distribution function for 2-process 4-parameter vitality model</h2>

<h3>Description</h3>

<p>Gives the cumulative survival proportions at <code>xx</code> from intrinsic process for a given set of parameter values.
</p>


<h3>Usage</h3>

<pre>
  SurvFn.in.4p(xx, r, s)
</pre>


<h3>Arguments</h3>

<table summary="R argblock">
<tr valign="top"><td><code>xx</code></td>
<td>
<p>vector of ages</p>
</td></tr>
<tr valign="top"><td><code>r</code></td>
<td>
<p>r value</p>
</td></tr>
<tr valign="top"><td><code>s</code></td>
<td>
<p>s value</p>
</td></tr>
</table>


<h3>Details</h3>

<p>Used within <code>vitality.4p</code> for estimating model parameters based on the observed cumulative survival function.</p>


<h3>Value</h3>

<p>vector of cumulative survival proportions at <code>xx</code> from intrinsic process
</p>


<h3>See Also</h3>

<p><code>vitality.4p</code>, <code>survProbInc.4p</code>, <code>SurvFn.4p</code>, , <code>SurvFn.ex.4p</code></p>


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