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crawl (version 2.2.0)

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

612

Version

2.2.0

License

CC0

Maintainer

Devin Johnson

Last Published

August 25th, 2018

Functions in crawl (2.2.0)

get_mask_segments

Identify segments of a path that cross through a restricted area
fillCols

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

Simulate possible path points conditioned on fit
crw_as_sf

Coerce to sf/sfc object
crw_as_tibble

Coerce crawl objects (crwIS and crwPredict) to tibbles
%>%

Pipe operator
fix_path

Project path away from restricted areas
intToPOSIX

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

Harbor seal relocation data set used in Johnson et al. (2008)
northernFurSeal

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

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

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

Plot CRW predicted object
crwPredict

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

Identify segments of a path that cross a restricted area
expandPred

Expand a time indexed data set with additional prediction times
crwSamplePar

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

tidy-like method for crwFit object
crwSimulator

Construct a posterior simulation object for the CTCRW state vectors
flatten

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

Start a shiny app to check data stored in a .csv file for model fitting with crwMLE function.
crawl-package

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

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

-2 * log-likelihood for CTCRW models
crwPostIS

Simulate a value from the posterior distribution of a CTCRW model
as.flat

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

Bearded Seal Location Data
aic.crw

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

Tranform Argos diagnostic data to covariance matrix form