Frequencies for first 10,000 rows of acc_prevmedc variable in mcbsatc2013 datas

     Before |
  usual doc |
  ever seen |
  other doc |      Freq.     Percent        Cum.
------------+-----------------------------------
         -8 |          1        0.01        0.01
         -7 |          1        0.01        0.02
          1 |        744        7.44        7.46
          2 |        122        1.22        8.68
          . |      9,132       91.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 24 May 2016