Frequencies for first 10,000 rows of cstratm variable in namcs2013 dataset :

     Masked |
   sampling |
    stratum |
 from which |
   provider |
        was |
   selected |      Freq.     Percent        Cum.
------------+-----------------------------------
   1.01e+07 |        815        8.15        8.15
   1.01e+07 |        977        9.77       17.92
   1.02e+07 |        924        9.24       27.16
   1.02e+07 |      1,093       10.93       38.09
   1.03e+07 |        727        7.27       45.36
   1.03e+07 |        805        8.05       53.41
   1.04e+07 |        868        8.68       62.09
   1.04e+07 |      1,256       12.56       74.65
   1.05e+07 |        860        8.60       83.25
   1.05e+07 |      1,014       10.14       93.39
   1.06e+07 |        451        4.51       97.90
   1.09e+07 |         31        0.31       98.21
   1.15e+07 |         91        0.91       99.12
   1.20e+07 |         27        0.27       99.39
   1.23e+07 |         20        0.20       99.59
   1.25e+07 |         41        0.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017