Re: st: sort of standardization

[Richard Goldstein <richgold@ix.netcom.com>]

if I understand correctly what you want, I would do the following within
a -foreach- loop:

summarize variable
calculate the range from r(min) and r(max)
divide the old variable by this calculated range inside a -gen-

e.g.,

foreach var of varlist .... {
qui su `var'
local range=r(max)-r(min)+1
gen `var'3=`var'/`range'
}

Rich

On 5/12/10 10:29 AM, Ginevra Biino wrote:
> Dear Statalist,
> I have to standardize many variables (in order to run PCA).
> Besides generating the n corresponding std(varname) vars, which I have
> already done, I also want to generate n new  variables obtained dividing
> each variable by its range. Can anybody help me?
> Ginevra
>  
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/