Frequencies for first 10,000 rows of stratm variable in namcs1995 dataset :

psu stratum |
     marker |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        201 |        884        8.84        8.84
        202 |      1,563       15.63       24.47
        203 |      1,052       10.52       34.99
        204 |        889        8.89       43.88
        401 |      1,131       11.31       55.19
        402 |      1,637       16.37       71.56
        403 |      2,028       20.28       91.84
        404 |        816        8.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016