mk_cov_rv: Make Covariate (and their powers) a RV

In rBatt/trawlDiversity: Long-term changes in species richness along the North American coastline

Description

Get the mean and SD of a covariate

Usage

mk_cov_rv(X, cName, across, by)

mk_cov_rv_pow(X, cName, across, by, pow = 2)

Arguments

X	data.table
cName	name of covariate
across	RV is computed across this dimension
by	RV is computed separately for each of these dimensions
pow	Raise to this power. Default is 2.

Details

Adds columns for the covarate, it's power, and both their sd's. Columns for SD's are named by appending "_sd", column for power is named by appending the numeric value of pow.

Value

NULL is retured, but the data.table is modified, with appropriate columns. Original covariate column will be modified.

Functions

• mk_cov_rv_pow: Get the mean and SD of a covariate, and the same for the covariate^pow

Examples

X <- data.table(a=rnorm(1000), b=sample(letters, 1000, replace=TRUE), key="b")
X[,K:=seq_along(a),by="b"]
mk_cov_rv_pow(X, "a", across="K", by="b", pow=2)

rBatt/trawlDiversity documentation built on Aug. 14, 2021, 1:01 p.m.