Compute a number-weighted average of variogram objects

This function takes a list of variogram objects and calculates its number-weighted average variogram.

# S3 method for variogram
mean(x,...)

Arguments

x

A variogram object or list of such objects to be averaged.

...

Additional variograms if specified individually.

Value

Returns a variogram object which is a dataframe containing the lag, the semi-variance estimate at that lag, and the approximate degrees of freedom associated with the semi-variance estimate.

References

C. H. Fleming, J. M. Calabrese, T. Mueller, K.A. Olson, P. Leimgruber, W. F. Fagan, ``From fine-scale foraging to home ranges: A semi-variance approach to identifying movement modes across spatiotemporal scales'', The American Naturalist, 183:5, E154-E167 (2014) doi:10.1086/675504 .

Author

J. M. Calabrese and C. H. Fleming

Note

Variogram averaging should only be used when there is a degree of similarity across individual variograms.

See also

plot.variogram, variogram.

Examples

# \donttest{
# Load package and data
library(ctmm)
data(buffalo)

# Calculate a list of variograms for all similar individuals in the dataset
# the 4th buffalo has a different sampling rate
SVFS <- lapply( buffalo[-4] , variogram )
# alternatively, we could variogram all at coarsest scale with variogram option dt

# Calculate the average variogram
SVF <- mean(SVFS)

# Plot the mean variogram
plot(SVF)

# }