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crawl (version 2.3.1)

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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Install

install.packages('crawl')

Monthly Downloads

633

Version

2.3.1

License

CC0

Issues

0

Pull Requests

0

Stars

20

Forks

8

Maintainer

Devin Johnson

Last Published

February 26th, 2026

Functions in crawl (2.3.1)

northernFurSeal

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

Generic subset/bracket method for crwIS classes
mergeTrackStop

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

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

tidy-like method for crwFit object
flatten

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

Pipe operator
harborSeal_sf

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

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

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

Bearded Seal Location Data
aic.crw

Calculates AIC for all objects of class crwFit listed as arguments
argosDiag2Cov

Transform Argos diagnostic data to covariance matrix form
crwPredictPlot

Plot CRW predicted object
crwMLE

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

Simulate a value from the posterior distribution of a CTCRW model
crawl-package

Fit Continuous-Time Correlated Random Walk Models to Animal Movement Data
crwN2ll

-2 * log-likelihood for CTCRW models
as.flat

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

Create a weighted importance sample for posterior predictive track simulation.
fillCols

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

Expand a time indexed data set with additional prediction times
crwSimulator

Construct a posterior simulation object for the CTCRW state vectors
fix_path

fix_path function id depreciated.
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