Frequencies for first 10,000 rows of cstratm variable in nhamcsed2007 dataset :

  clustered |
  cstratm - |
     masked |      Freq.     Percent        Cum.
------------+-----------------------------------
   2.01e+07 |      1,405       14.05       14.05
   2.02e+07 |        796        7.96       22.01
   2.03e+07 |        698        6.98       28.99
   2.04e+07 |      1,557       15.57       44.56
   4.01e+07 |      1,214       12.14       56.70
   4.02e+07 |      1,174       11.74       68.44
   4.03e+07 |      2,757       27.57       96.01
   4.04e+07 |        399        3.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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