Frequencies for first 10,000 rows of stratm variable in namcs1993 dataset :

psu stratum |
     marker |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        201 |      1,425       14.25       14.25
        202 |      1,132       11.32       25.57
        203 |        962        9.62       35.19
        204 |      1,038       10.38       45.57
        401 |      1,586       15.86       61.43
        402 |      1,424       14.24       75.67
        403 |      1,655       16.55       92.22
        404 |        778        7.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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