scompvar

compvar

Computes the average components of variation among sampling units and within
samples in relation to sampling effort.

A system for calculating the optimal sampling effort, based on the ideas of
"Ecological cost-benefit optimization" as developed by A. Underwood (1997,
ISBN 0 521 55696 1). Data is obtained from simulated ecological communities with
prep_data() which formats and arranges the initial data, and then the
optimization follows the following procedure of four functions: (1) prep_data()
takes the original dataset and creates simulated sets that can be used as a
basis for estimating statistical power and type II error. (2) sim_beta() is used
to estimate the statistical power for the different sampling efforts specified
by the user. (3) sim_cbo() calculates then the optimal sampling effort, based
on the statistical power and the sampling costs. Additionally, (4) scompvar()
calculates the variation components necessary for (5) Underwood_cbo() to calculate
the optimal combination of number of sites and samples depending on either
an economic budget or on a desired statistical accuracy. Lastly, (6) plot_power()
helps the user visualize the results of sim_beta().

Arturo Sanchez-Porras

ecocbo

Calculating Optimum Sampling Effort in Community Ecology

Edlin Guerra-Castro

scompvar function

<dl><dt>data</dt>
<dd>Object of class <code>"ecocbo_data"</code> obtained from <code>prep_data()</code>.</dd>
<dt>n</dt>
<dd>Optional. Integer. Number of samples to consider.</dd>
<dt>m</dt>
<dd>Optional. Integer. Number of replicates to consider.</dd></dl>

Arguments

Edlin Guerra-Castro (<a href="/link/edlinguerra%40gmail.com?package=ecocbo&version=1.0.0" data-mini-rdoc="ecocbo::edlinguerra@gmail.com">edlinguerra@gmail.com</a>), Arturo Sanchez-Porras

Author

Simulated Components of Variation — scompvar

<dl>

<dt>data</dt>
<dd>Object of class <code>"ecocbo_data"</code> obtained from <code>prep_data()</code>.</dd>


<dt>n</dt>
<dd>Optional. Integer. Number of samples to consider.</dd>


<dt>m</dt>
<dd>Optional. Integer. Number of replicates to consider.</dd>

</dl>

Edlin Guerra-Castro (<a href='mailto:edlinguerra@gmail.com'>edlinguerra@gmail.com</a>), Arturo Sanchez-Porras

scompvar: Simulated Components of Variation

Description

Usage

Value

Arguments

Author

Details

References

See Also

Examples