Frequencies for first 10,000 rows of cstratm variable in nhamcsed2015 dataset :

  Clustered |
 CSTRATM -- |
     masked |      Freq.     Percent        Cum.
------------+-----------------------------------
   2.01e+07 |      2,495       24.95       24.95
   2.02e+07 |      2,457       24.57       49.52
   4.01e+07 |      1,601       16.01       65.53
   4.02e+07 |      3,196       31.96       97.49
   4.03e+07 |        251        2.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017