stdz: Standardizes any numerical vector, with weights.

In weights: Weighting and Weighted Statistics

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)

Example output

Loading required package: Hmisc
Loading required package: lattice
Loading required package: survival
Loading required package: Formula
Loading required package: ggplot2

Attaching package: 'Hmisc'

The following objects are masked from 'package:base':

    format.pval, units

Loading required package: gdata
sh: 1: cannot create /dev/null: Permission denied
gdata: Unable to locate valid perl interpreter
gdata: 
gdata: read.xls() will be unable to read Excel XLS and XLSX files
gdata: unless the 'perl=' argument is used to specify the location of a
gdata: valid perl intrpreter.
gdata: 
gdata: (To avoid display of this message in the future, please ensure
gdata: perl is installed and available on the executable search path.)
sh: 1: cannot create /dev/null: Permission denied
gdata: Unable to load perl libaries needed by read.xls()
gdata: to support 'XLX' (Excel 97-2004) files.

gdata: Unable to load perl libaries needed by read.xls()
gdata: to support 'XLSX' (Excel 2007+) files.

gdata: Run the function 'installXLSXsupport()'
gdata: to automatically download and install the perl
gdata: libaries needed to support Excel XLS and XLSX formats.

Attaching package: 'gdata'

The following object is masked from 'package:stats':

    nobs

The following object is masked from 'package:utils':

    object.size

The following object is masked from 'package:base':

    startsWith

Loading required package: mice

Attaching package: 'mice'

The following objects are masked from 'package:base':

    cbind, rbind

    Min.  1st Qu.   Median     Mean  3rd Qu.     Max. 
-0.93891 -0.93891 -0.06259  0.00000  0.81372  1.69004 
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
-1.4851 -1.4851 -0.5775 -0.5127  0.3300  1.2376 
[1] 7.401487e-17
[1] 1

weights documentation built on June 11, 2021, 1:06 a.m.