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AW: AW: st: sort of standardization
From
"Martin Weiss" <[email protected]>
To
<[email protected]>
Subject
AW: AW: st: sort of standardization
Date
Wed, 12 May 2010 16:56:23 +0200
<>
" I think of the range as the min
to the max *inclusive* of each endpoint;"
Gotcha! But what do non-integer values do to your conviction?
*************
clear*
set obs 1000
set seed 1001
gen x=rnormal()
su x
di in r "Range " %3.2fc r(max)-r(min) " or " %3.2fc r(max)-r(min) +1 " ?"
*************
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Richard
Goldstein
Gesendet: Mittwoch, 12. Mai 2010 16:51
An: [email protected]
Cc: Martin Weiss
Betreff: Re: AW: st: sort of standardization
Martin,
look at it this way -- if my min is 1 and my max is 10, then the range
is 10 (it seems to me), not 9 -- i.e., I think of the range as the min
to the max *inclusive* of each endpoint; StataCorp apparently disagrees ;-)
Rich
On 5/12/10 10:46 AM, Martin Weiss wrote:
>
> <>
>
> " 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: [email protected]
> [mailto:[email protected]] Im Auftrag von Richard
> Goldstein
> Gesendet: Mittwoch, 12. Mai 2010 16:40
> An: [email protected]
> 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
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