dummy_ddf

Create a detection function object for strip/plot surveys for use with
<code>dht2</code>.

A simple way of fitting detection functions to distance sampling
data for both line and point transects. Adjustment term selection, left and
right truncation as well as monotonicity constraints and binning are
supported. Abundance and density estimates can also be calculated (via a
Horvitz-Thompson-like estimator) if survey area information is provided. See
Miller et al. (2019) <doi:10.18637/jss.v089.i01> for more information on
methods and <https://examples.distancesampling.org/> for example analyses.

Laura Marshall

Distance

Distance Sampling Detection Function and Abundance Estimation

dummy_ddf function

<dl><dt>data</dt>
<dd>as specified for <code>ds</code> and <code>ddf</code> (including a <code>size</code> column)</dd>
<dt>width</dt>
<dd>right truncation</dd>
<dt>left</dt>
<dd>left truncation (default 0, no left truncation)</dd>
<dt>transect</dt>
<dd><code>"line"</code> or <code>"point"</code> transect</dd></dl>

Arguments

Author

Detection function objects when detection is certain — dummy_ddf

<dl>

<dt>data</dt>
<dd>as specified for <code>ds</code> and <code>ddf</code> (including a <code>size</code> column)</dd>


<dt>width</dt>
<dd>right truncation</dd>


<dt>left</dt>
<dd>left truncation (default 0, no left truncation)</dd>


<dt>transect</dt>
<dd><code>"line"</code> or <code>"point"</code> transect</dd>

</dl>

dummy_ddf: Detection function objects when detection is certain

Description

Usage

Arguments

Author