stdz {weights}

Standardizes any numerical vector, with weights.

Description

stdz produces a standardized copy of any input variable. It can also standardize a weighted variable to produce a copy of the original variable standardized around its weighted mean and variance.

Usage

stdz(x, weight=NULL)

Arguments

x

x should be a numerical vector which the researcher wishes to standardize.

weight

weight is an optional vector of weights to be used to determining the weighted mean and variance for standardization.

Value

A vector of length equal to x with a (weighted) mean of zero and a (weighted) standard deviation of 1.

Author(s)

Josh Pasek, Assistant Professor of Communication Studies at the University of Michigan (www.joshpasek.com).

See Also

wtd.cor wtd.chi.sq wtd.t.test

Examples

test <- c(1,1,1,1,1,1,2,2,2,3,3,3,4,4)
weight <- c(.5,.5,.5,.5,.5,1,1,1,1,2,2,2,2,2)

summary(stdz(test))
summary(stdz(test, weight))
wtd.mean(stdz(test, weight), weight)
wtd.var(stdz(test, weight), weight)