rhrSchoener: Schoener's ratio

In jmsigner/rhr: Reproducible Home Ranges with R

Description

Function to calculate Schoeners V.

Usage

rhrSchoener(dat, interval, alpha = 0.25, minM = 10, consec = TRUE)

Arguments

dat	data.frame with 3 columns. The first column contains x coordinates, the second column contains y coordinates and the third column contains a timestamp as POSIXct.
interval	Numeric scalar, the interval in seconds.
alpha	Numeric scalar, alpha value used to calculate the critical value.
minM	Numeric scalar, the minimum number of pairs required, if m is smaller than this argument it will return NA.
consec	Locagical scalar, indicates whether or not the observations are consecutive (i.e., equally spaced in time) or not.

Details

This implementation uses the normal distribution as a sampling distribution. Relocations are ordered by timestamp and then relocations are sampled based on interval. If relocations are not equally spaced the nearest relocation forward is used.

Value

vector vector of length six.

• "V"Schoeners V

• "m"Number of pairs used

• "r2"Mean squared distance from the center of activity

• "t2"Mean squared distance between relocations

• "cv"Critical value

• "m"The time interval in seconds

References

Swihart, R. and Slade N. 1985, Testing for indpendence of observations in animal movement, _Ecology_, 66(4), 1176 - 1184

jmsigner/rhr documentation built on June 26, 2020, 8:59 a.m.