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# st: RE: median for last 3 years within groups

 From "Martin Weiss" <[email protected]> To <[email protected]> Subject st: RE: median for last 3 years within groups Date Mon, 29 Sep 2008 18:06:34 +0200

```sysuse auto, clear
_pctile mpg, p(50)
ret li
di in red r(r1)

to get the median elegantly into r(r1). I hope you know how to take it from
there... BTW, -if- and -in- are allowed with -_pctile-...

HTH
Martin

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Fabian Brenner
Sent: Monday, September 29, 2008 6:03 PM
To: [email protected]
Subject: st: median for last 3 years within groups

Dear all:

I have 10 different "groups" of people and I want to get the median "age"
(across observations) for the last 3 years within each group for each year.

I have the following idea but unfortunately I don't have any idea how to get
the median.

sort year group
genenerate threeyearmedian=.
generate median=.

quietly forvalues k = 1/10 {
quietly forvalues y = 1982/2006 {
local y1 = `y' - 3
local y2 = `y' - 1
generate median = ??? median age ???  if inrange(year, `y1', `y2') &
group==`k'
replace threeyearmedian median if year == `y' & group ==`k'
}
}

Hope someone can help me.
Fabian

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