check.cols

Internal function to check that supplied <code>data.frames</code> have the correct
columns and checks that sample labels are all unique.

Density surface modelling of line transect data. A Generalized
Additive Model-based approach is used to calculate spatially-explicit estimates
of animal abundance from distance sampling (also presence/absence and strip
transect) data. Several utility functions are provided for model checking,
plotting and variance estimation.

Laura Marshall

Density Surface Modelling of Distance Sampling Data

check.cols function

<dl><dt>ddf.obj</dt>
<dd>a <code>ddf</code> object from <code>mrds</code></dd>
<dt>segment.data</dt>
<dd>segment data as defined in <code>dsm</code></dd>
<dt>observation.data</dt>
<dd>observation data as defined in <code>dsm</code></dd>
<dt>segment.area</dt>
<dd>area of segments</dd></dl>

Arguments

Author

Check column names exist — check.cols

<dl>

<dt>ddf.obj</dt>
<dd>a <code>ddf</code> object from <code>mrds</code></dd>


<dt>segment.data</dt>
<dd>segment data as defined in <code>dsm</code></dd>


<dt>observation.data</dt>
<dd>observation data as defined in <code>dsm</code></dd>


<dt>segment.area</dt>
<dd>area of segments</dd>

</dl>

check.cols: Check column names exist

Description

Usage

Value

Arguments

Author