Frequencies for pvin_rest variable in parkwork dataset :

        vin |
  restraint |
       type |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        844       77.36       77.36
          4 |         16        1.47       78.83
          7 |         12        1.10       79.93
          A |         36        3.30       83.23
          B |          2        0.18       83.41
          E |         93        8.52       91.93
          K |         13        1.19       93.13
          L |          1        0.09       93.22
          M |         17        1.56       94.78
          R |          2        0.18       94.96
          S |          2        0.18       95.14
          U |         53        4.86      100.00
------------+-----------------------------------
      Total |      1,091      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016