Frequencies for first 10,000 rows of cstratm variable in nhamcsed2006 dataset :

  clustered |
  cstratm - |
     masked |      Freq.     Percent        Cum.
------------+-----------------------------------
   2.01e+07 |      1,761       17.61       17.61
   2.02e+07 |      1,086       10.86       28.47
   2.03e+07 |        604        6.04       34.51
   2.04e+07 |      1,537       15.37       49.88
   2.05e+07 |        730        7.30       57.18
   4.01e+07 |        589        5.89       63.07
   4.02e+07 |        991        9.91       72.98
   4.03e+07 |      1,779       17.79       90.77
   4.04e+07 |        923        9.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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