Frequencies for first 10,000 rows of cstratm variable in nhamcsed2009 dataset :

  clustered |
  cstratm - |
     masked |      Freq.     Percent        Cum.
------------+-----------------------------------
   2.01e+07 |      1,699       16.99       16.99
   2.02e+07 |        987        9.87       26.86
   2.03e+07 |      1,111       11.11       37.97
   2.04e+07 |      1,373       13.73       51.70
   4.01e+07 |        712        7.12       58.82
   4.02e+07 |        913        9.13       67.95
   4.03e+07 |      2,480       24.80       92.75
   4.04e+07 |        725        7.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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