Frequencies for first 10,000 rows of cstratm variable in nhamcsed2005 dataset :

  clustered |
  cstratm - |
     masked |      Freq.     Percent        Cum.
------------+-----------------------------------
   2.01e+07 |      1,381       13.81       13.81
   2.02e+07 |        875        8.75       22.56
   2.03e+07 |        701        7.01       29.57
   2.04e+07 |      1,142       11.42       40.99
   4.01e+07 |        829        8.29       49.28
   4.02e+07 |        657        6.57       55.85
   4.03e+07 |      3,264       32.64       88.49
   4.04e+07 |      1,151       11.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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