Frequencies for first 10,000 rows of prov4470 variable in posclia2010 dataset :

     survey |
certificate |
   schedule |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,368       93.68       93.68
          A |        156        1.56       95.24
          B |          2        0.02       95.26
          C |        110        1.10       96.36
          D |         10        0.10       96.46
          E |         81        0.81       97.27
          F |         31        0.31       97.58
          G |         20        0.20       97.78
          H |         64        0.64       98.42
          I |          4        0.04       98.46
          J |          6        0.06       98.52
          V |        148        1.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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