range of quartiles

[abdelilah arredouani]

Dear colleagues,
I have created 4 quartiles of a variable (age) that goes form 18 to 89. What is the command if i would like to know the range of the second quartile for example?

thanks for your help


stata/IC 15.1 mac

[Nick Cox]

I think you mean 4 quartile bins or classes. This may help in terms of technique:

. sysuse auto, clear
(1978 Automobile Data)

. xtile mpg4=mpg, nq(4)

. tabstat mpg, s(n min max) by(mpg4)

Summary for variables: mpg
     by categories of: mpg4 (4 quantiles of mpg)

    mpg4 |         N       min       max
---------+------------------------------
       1 |        27        12        18
       2 |        11        19        20
       3 |        22        21        25
       4 |        14        26        41
---------+------------------------------
   Total |        74        12        41
----------------------------------------