Frequencies for first 10,000 rows of stratm variable in namcs1996 dataset :

psu stratum |
     marker |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        201 |      1,050       10.50       10.50
        202 |      1,086       10.86       21.36
        203 |      1,005       10.05       31.41
        204 |      1,549       15.49       46.90
        401 |        845        8.45       55.35
        402 |      1,279       12.79       68.14
        403 |      2,236       22.36       90.50
        404 |        950        9.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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