Frequencies for first 10,000 rows of prov1620 variable in posclia2010 dataset :

      prior |
intermediar |
   y number |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,894       98.94       98.94
      00030 |          7        0.07       99.01
      00320 |          1        0.01       99.02
      00520 |          3        0.03       99.05
      01030 |         87        0.87       99.92
      03001 |          6        0.06       99.98
      03102 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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