Possible Duplicate:
R, correlation: is there a func that converts a vector of nums to a vector of standard units
By reading stackoverflow's comments, I found z-score maybe calculated with Python or perl, but I did not comes across any for R yet. Did I miss it? Is it possible to be done with R?
As (http://en.wikipedia.org/wiki/Standard_score.)
z-score = (x-μ)/σ
x is a raw score to be standardized;
μ is the mean of the population;
σ is the standard deviation of the population.
I believe there are R packages designed for this? Where can we found them? Or similar package for normalization?
Answer
if x is a vector with raw scores then scale(x) is a vector with standardized scores.
Or manually: (x-mean(x))/sd(x)