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st: RE: recoding variables with different min & max into standard scale
From
Nick Cox <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
st: RE: recoding variables with different min & max into standard scale
Date
Wed, 2 Feb 2011 17:49:30 +0000
foreach v of var <varlist> {
su `v', meanonly
gen new_`v' = (`v' - r(min))/(r(max) - r(min))
}
There's also a dedicated -egen- function from Stas Kolenikov:
_gstd01 from http://web.missouri.edu/~kolenikovs/stata
_gstd01 -- Standardize to [0,1] / / Author: Stas Kolenikov,
[email protected] / This program is an extension to the egen
command / that standardize the specified variable into [0,1] range / so
that 0 corresponds to the minimum value, and 1, / to the maximum
Nick
[email protected]
Daniel Laurison
I have a couple hundred variables all with different ranges, and I
just need to get them all to be 0-1 (not dummies, but continuous with
the min value 0 and max value 1 and everything in between keeping its
original proportions; I'd be just as happy with 0-100 or etc.). I
don't need ranks or "standardized" i.e. egen std(var) values. The
mathematical formula is simply [var- min(var)]/[max(var)-min(var)] but
I can't figure out how to make Stata do that; I know I could get the
ranks, but I want to keep the relative values. My workaround is to
egen the constant max & min of each var, and then do a foreach loop
with the maxvars & minvars for each var in the formula... but there
has to be a neater, more elegant solution, right?
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