Frequencies for first 10,000 rows of stratm variable in namcs2000 dataset :

psu stratum |
     marker |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        201 |      1,289       12.89       12.89
        202 |        959        9.59       22.48
        203 |        816        8.16       30.64
        204 |      1,398       13.98       44.62
        401 |      1,052       10.52       55.14
        402 |      1,675       16.75       71.89
        403 |      1,842       18.42       90.31
        404 |        969        9.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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