Frequencies for first 10,000 rows of prov4470 variable in posclia2008 dataset :

     survey |
certificate |
   schedule |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,370       93.70       93.70
          A |        154        1.54       95.24
          B |          2        0.02       95.26
          C |        122        1.22       96.48
          D |         13        0.13       96.61
          E |         61        0.61       97.22
          F |         30        0.30       97.52
          G |         17        0.17       97.69
          H |         61        0.61       98.30
          I |          3        0.03       98.33
          J |          5        0.05       98.38
          V |        162        1.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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