setinitial.ds

sethazard

For a given detection function, it computes the initial values for the
parameters including scale and shape parameters and adjustment function
parameters if any. If there are user-defined initial values only the
parameters not specified by the user are computed.

Animal abundance estimation via conventional, multiple covariate
and mark-recapture distance sampling (CDS/MCDS/MRDS). Detection function
fitting is performed via maximum likelihood. Also included are diagnostics
and plotting for fitted detection functions. Abundance estimation is via a
Horvitz-Thompson-like estimator.

Laura Marshall

mrds

Mark-Recapture Distance Sampling

setinitial.ds function

<dl><dt>ddfobj</dt>
<dd>distance detection function object</dd>
<dt>width</dt>
<dd>half-width of transect or radius of point count</dd>
<dt>initial</dt>
<dd>list of user-defined initial values with possible elements:
<code>scale</code>, <code>shape</code>, <code>adjustment</code></dd>
<dt>point</dt>
<dd>if <code>TRUE</code>, point count data; otherwise, line transect data</dd>
<dt>left</dt>
<dd>left truncation</dd>
<dt>dmat</dt>
<dd><code>xmat</code> from <code>ddfobj</code></dd></dl>

Arguments

Author

Set initial values for detection function based on distance sampling — setinitial.ds

<dl>

<dt>ddfobj</dt>
<dd>distance detection function object</dd>


<dt>width</dt>
<dd>half-width of transect or radius of point count</dd>


<dt>initial</dt>
<dd>list of user-defined initial values with possible elements:
<code>scale</code>, <code>shape</code>, <code>adjustment</code></dd>


<dt>point</dt>
<dd>if <code>TRUE</code>, point count data; otherwise, line transect data</dd>


<dt>left</dt>
<dd>left truncation</dd>


<dt>dmat</dt>
<dd><code>xmat</code> from <code>ddfobj</code></dd>

</dl>

setinitial.ds: Set initial values for detection function based on distance sampling

Description

Usage

Value

Arguments

Author