Re: st: How to put max and min values in a loop

[Xixi Lin <winnielxx@gmail.com>]

Hi Nick,

You are right, the min() and max() seems to be not working. My
original code is like:
   foreach z of numlist 2/120 {
   foreach x in x1 x2 x3 x4 x5{
   foreach j of numlist 10 15 20 25 30 35 40 45 50 55{
      qui ttest Return if inlist(group_`x',1,10) & Period==`z' &
Sector==`j', by(group_`x') unequal
      display "`x'"   "Period "  "`z'"  "Sector "  "`j'" `r(p_l)'
`r(p)'  `r(p_u)'
      }
   }
}

however, for some independent variables, group 10 is not available,
and I wanna use 9 instead, that is why I try to use max() instead of
specifying 10 or 9 or even 8 . Do you know how to change the code
which will ttest the first group and the last group?

Thank you so much.

Best,
Xixi Lin
On Wed, Mar 27, 2013 at 10:23 AM, Nick Cox <njcoxstata@gmail.com> wrote:
> This is likely to be wrong for several reasons.
>
> -min()- and -max()- in this context can only be Stata functions and
> each requires two or more arguments. This is not quite explicit in the
> help.
>
> Also, even when legal, statements including -min()- or -max()- will
> only evaluate within observations.
>
> You assume that we know what you want to do, which is not true.
> However, we can guess that you want minimum and maximum of some
> variable, in which case -summarize- first will give you r(min) and
> r(max), which you can use within -inrange()-. -summarize, meanonly- is
> sufficient if min and max are all you need.
>
> But, but, but: it is vacuous that any variable lies between its
> minimum and maximum, so there is no point to doing this unless the
> calculation of -summarize- refers to something different, e.g. a
> different subset or a different variable.
>
> Nick
>
> On Wed, Mar 27, 2013 at 2:11 PM, Xixi Lin <winnielxx@gmail.com> wrote:
>
>> I am trying to use inlist(var, min(var), max(var)) in a loop; however,
>> min(var) and max(var) seems to be wrong codes, does anyone know how to
>> code it in a right way?
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