Frequencies for first 10,000 rows of prov2885 variable in pos1997 dataset :

    type of |
    control |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        122        1.22        1.22
         01 |      1,739       17.39       18.61
         02 |      1,547       15.47       34.08
         03 |      2,910       29.10       63.18
         04 |      1,308       13.08       76.26
         05 |        504        5.04       81.30
         06 |        801        8.01       89.31
         07 |        332        3.32       92.63
         08 |        215        2.15       94.78
         09 |         20        0.20       94.98
         10 |          1        0.01       94.99
         11 |          9        0.09       95.08
         12 |          7        0.07       95.15
         13 |          5        0.05       95.20
         1A |         48        0.48       95.68
         1B |        130        1.30       96.98
         1C |         19        0.19       97.17
         2A |          6        0.06       97.23
         2B |        275        2.75       99.98
         2C |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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