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

  Ever told |
        had |
   problems |
with valves |      Freq.     Percent        Cum.
------------+-----------------------------------
         -8 |         56        0.56        0.56
         -7 |          2        0.02        0.58
          1 |        909        9.09        9.67
          2 |      9,033       90.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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