Frequencies for first 10,000 rows of drug5cl2 variable in nhamcsed2002 dataset :

   drug5cl2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,912       99.12       99.12
       0120 |          1        0.01       99.13
       0507 |          2        0.02       99.15
       0508 |          3        0.03       99.18
       0512 |          1        0.01       99.19
       0513 |          1        0.01       99.20
       0874 |          3        0.03       99.23
       0875 |          2        0.02       99.25
       0877 |          1        0.01       99.26
       1265 |          2        0.02       99.28
       1275 |          3        0.03       99.31
       1373 |          2        0.02       99.33
       1374 |          1        0.01       99.34
       1567 |          1        0.01       99.35
       1569 |          6        0.06       99.41
       1671 |          6        0.06       99.47
       1721 |          4        0.04       99.51
       1722 |          1        0.01       99.52
       1724 |         20        0.20       99.72
       1727 |          1        0.01       99.73
       1728 |         13        0.13       99.86
       1943 |          1        0.01       99.87
       1944 |          2        0.02       99.89
       2095 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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