Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.

# AW: st: sort of standardization

 From "Martin Weiss" To Subject AW: st: sort of standardization Date Wed, 12 May 2010 16:46:38 +0200

```<>

" local range=r(max)-r(min)+1"

Rich, what does the "+1" term do for the "range"? I took the definition in
my code from [R], page 204. Am I missing anything?

HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Richard
Goldstein
Gesendet: Mittwoch, 12. Mai 2010 16:40
An: statalist@hsphsun2.harvard.edu
Cc: Ginevra Biino
Betreff: Re: st: sort of standardization

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/

*
*   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/
```