Frequencies for first 10,000 rows of prov6185 variable in pos2008 dataset :

 srv: shock |
       wave |
lithotripte |
          r |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,655       86.55       86.55
          0 |      1,294       12.94       99.49
          1 |         10        0.10       99.59
          2 |         32        0.32       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017