Frequencies for pvin_rest variable in parkwork dataset :

        VIN |
  Restraint |
       type |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        786       78.44       78.44
          4 |         26        2.59       81.04
          7 |          5        0.50       81.54
          A |         36        3.59       85.13
          E |         68        6.79       91.92
          K |         11        1.10       93.01
          L |          3        0.30       93.31
          M |         18        1.80       95.11
          R |          1        0.10       95.21
          U |         45        4.49       99.70
          W |          3        0.30      100.00
------------+-----------------------------------
      Total |      1,002      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016