Make.Z {QuantPsyc} | R Documentation |
Standardize Data
Description
Converts data to standard normal (mean = 0; SD = 1) - i.e., z-scores.
Usage
Make.Z(x)
Arguments
x |
Any data object (especially useful for multiple columns of a data.frame). |
Details
Takes the data (by columns if necessary) and subtracts out the mean and then divides by the standard deviation. The result is a standard normal z score.
Value
A numeric or matrix containing standardized data (i.e., z scores)
Warning
The result is a matrix. One may wish to convert to data.frame or use as.data.frame(Make.Z(x))
Author(s)
Thomas D. Fletcher t.d.fletcher05@gmail.com
Examples
zUSJR <- Make.Z(USJudgeRatings) # creates new object containg z scores
dim(zUSJR) # shows that there are 43 observed z scores for 12 variables
zUSJR[,1] # to look at only the first column of z scores
[Package QuantPsyc version 1.6 Index]