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crawl (version 2.3.0)

Fit Continuous-Time Correlated Random Walk Models to Animal Movement Data

Description

Fit continuous-time correlated random walk models with time indexed covariates to animal telemetry data. The model is fit using the Kalman-filter on a state space version of the continuous-time stochastic movement process.

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Version

Install

install.packages('crawl')

Monthly Downloads

703

Version

2.3.0

License

CC0

Maintainer

Devin Johnson

Last Published

October 9th, 2022

Functions in crawl (2.3.0)

crwPredict

Predict animal locations and velocities using a fitted CTCRW model and calculate measurement error fit statistics
argosDiag2Cov

Transform Argos diagnostic data to covariance matrix form
expandPred

Expand a time indexed data set with additional prediction times
fillCols

Fill missing values in data set (or matrix) columns for which there is a single unique value
displayPar

Display the order of parameters along with fixed values and starting values
detect_timescale

Detect appropriate time scale for movement analysis
crw_as_sf

Coerce to sf/sfc object
crw_as_tibble

Coerce crawl objects (crwIS and crwPredict) to tibbles
flatten

'Flattening' a list-form crwPredict object into a data.frame
fix_path

fix_path function id depreciated.
crwSimulator

Construct a posterior simulation object for the CTCRW state vectors
crwSamplePar

Create a weighted importance sample for posterior predictive track simulation.
[.crwIS

Generic subset/bracket method for crwIS classes
intToPOSIX

Reverse as.numeric command that is performed on a vector of type POSIXct
mergeTrackStop

Merge a location data set with a dry time (or other stopping) covariate
tidy_crwFit

tidy-like method for crwFit object
northernFurSeal

Northern fur seal pup relocation data set used in Johnson et al. (2008)
%>%

Pipe operator
harborSeal

Harbor seal location data set used in Johnson et al. (2008)
harborSeal_sf

Harbor seal location data updated since Johnson et al. (2008)
crwN2ll

-2 * log-likelihood for CTCRW models
crwPredictPlot

Plot CRW predicted object
aic.crw

Calculates AIC for all objects of class crwFit listed as arguments
crwMLE

Fit Continuous-Time Correlated Random Walk Models to Animal Telemetry Data
as.flat

'Flattening' a list-form crwPredict object into a data.frame
crawl-package

Fit Continuous-Time Correlated Random Walk Models to Animal Movement Data
crwPostIS

Simulate a value from the posterior distribution of a CTCRW model
beardedSeals

Bearded Seal Location Data