Frequencies for first 10,000 rows of prov2885 variable in pos1993 dataset :

    type of |
    control |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        123        1.23        1.23
         01 |      1,021       10.21       11.44
         02 |      1,774       17.74       29.18
         03 |      2,824       28.24       57.42
         04 |      2,091       20.91       78.33
         05 |        500        5.00       83.33
         06 |        497        4.97       88.30
         07 |        559        5.59       93.89
         08 |        212        2.12       96.01
         09 |         28        0.28       96.29
         10 |         61        0.61       96.90
         11 |         51        0.51       97.41
         12 |          8        0.08       97.49
         13 |         15        0.15       97.64
         15 |          3        0.03       97.67
         1A |         32        0.32       97.99
         1B |         48        0.48       98.47
         1C |         11        0.11       98.58
         2A |          3        0.03       98.61
         2B |        138        1.38       99.99
         2C |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016