Summarize a range distribution
This function returns a list of biologically interesting parameters in human readable format, as derived from an autocorrelated kernel density estimate.
## S3 method for class 'UD' summary(object,level=0.95,level.UD=0.95,units=TRUE,...)
object |
An |
level |
Confidence level for the above area estimate. E.g., the 95% confidence interval of the 50% core area. |
level.UD |
Coverage level for the home-range area. E.g., the 50% core area. |
units |
Convert result to natural units. |
... |
Unused options. |
A matrix with low, maximum likelihood, and high estimates for the following parameters:
areaThe home-range area with fraction of inclusion level.UD. E.g., the 50% core home range is estimated with level.UD=0.50, and 95% confidence intervals are placed on that area estimate with level=0.95.
This kernel density estimate differs from the Gaussian estimate of summary.ctmm. The Gaussian estimate has more statistical efficiency, but is less related to space use for non-Gaussian processes.
Prior to ctmm v0.3.1, AKDEs included only errors due to autocorrelation uncertainty, which are insignificant in cases such as IID data.
Starting in v0.3.1, akde calculated an effective sample size DOF.H and used this to estimate area uncertainty under a chi-square approxmation.
Starting in v0.3.2, this method was improved to use DOF.area in the Gaussian reference function approximation.
C. H. Fleming.
C. H. Fleming, J. M. Calabrese. A new kernel-density estimator for accurate home-range and species-range area estimation. Methods in Ecology and Evolution, 8:5, 571-579 (2016) doi: 10.1111/2041-210X.12673.
akde.
# Load package and data library(ctmm) data(buffalo) # Extract movement data for a single animal Cilla <- buffalo$Cilla # Fit a movement model GUESS <- ctmm.guess(Cilla,interactive=FALSE) FIT <- ctmm.fit(Cilla,GUESS) # Estimate and summarize the AKDE UD <- akde(Cilla,FIT) summary(UD)
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