LTDataFrame: Creates covariate dataframes
Description
Creates covariate dataframes for observations and dummy quadrature pointsUsage
LTDataFrame(study.area, lines, lines.psp, int.formula, det.formula, covariates, Q.lt)
Arguments
study.area
owin object that defines study area
lines.psp
psp class with added list elements width and label
int.formula
model formula for intensity process
det.formula
model formula for detection scale process
covariates
covariate dataframe (see DSpat for structure)
Q.lt
lt quadscheme of class quad
Value
- cov.df
- dataframe of covariates followed by rows for covariates for dummy quadrature points
- covariate.im
- list of covariate images
Details
Checks to make sure that all of the variables used in formula are either in covariates
or in lines. Then it extracts the values of covariates for
each observation and for dummy points. These are merged with the needed covariates
from lines and then a single dataframe is returned with the observations followed
by the dummy points. In addition, the covariate images in a list are returned to keep
with the dspat object for use in integrate.intensity.