Frequencies for first 10,000 rows of cstratm variable in nhamcsopd2006 dataset :

  clustered |
 cstratm -- |
     masked |      Freq.     Percent        Cum.
------------+-----------------------------------
   2.01e+07 |      1,467       14.67       14.67
   2.02e+07 |      1,289       12.89       27.56
   2.03e+07 |        791        7.91       35.47
   2.04e+07 |        711        7.11       42.58
   2.05e+07 |        488        4.88       47.46
   4.01e+07 |      1,164       11.64       59.10
   4.02e+07 |      1,262       12.62       71.72
   4.03e+07 |      2,239       22.39       94.11
   4.04e+07 |        589        5.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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