# st: RE: RE: How to find the minimum and maximum values of a column?

 From "Nick Cox" To Subject st: RE: RE: How to find the minimum and maximum values of a column? Date Tue, 20 Jun 2006 18:37:16 +0100

```For "column" read "variable" throughout.

The limits on matrix size are given in the help
on -limits-. The limits you quote apply to Intercooled
Stata, but with Stata/SE and Stata/MP you can go
much bigger.

But that is not relevant here. As Alex indicates,
you can use -summarize- directly.

So, for example,

foreach v of var a b c d {
su `v', meanonly
gen st`v' = (`v' - r(min)) / (r(max) - r(min))
}

Also, see the results of

findit std01

for the same idea implemented otherwise.

Nick
n.j.cox@durham.ac.uk

Alex Ogan

> There are several ways to do this.  -search min- and -search
> max- would
> point you to them, although it wouldn't be immediately obvious which
> links to click on.  Anyway, here are two:
>
> -summarize varname- will create scalars r(min) and r(max).
>
> -egen min_varname = min(varname)- will create a new variable
> containing
> the minimum across all observations.

Laura Flamand

> I am working in a program to estimate an index similar to the Index of
> Human Development (PNUD, various  years), and I need to find the
> maximum and minimum value of several variables across 2500
> observations, I will then use these values to normalize the variables.
> I know how to find min and max values across rows, but I cannot find a
> command to find these min and max values across columns, other than to
> transpose the data set with xpose, or to transform my data set into a
> matrix (but then I can only have a 800x800 matrix, right?)

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```