Frequencies for first 10,000 rows of prov4275 variable in posclia2001 dataset :

   prov4275 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,991       99.91       99.91
 01D0961235 |          1        0.01       99.92
 01D0961241 |          1        0.01       99.93
 01D0961243 |          6        0.06       99.99
 03D0000001 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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