Frequencies for first 10,000 rows of prov6185 variable in pos2010 dataset :

 SRV: SHOCK |
       WAVE |
LITHOTRIPTE |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,626       86.26       86.26
          0 |      1,278       12.78       99.04
          1 |         20        0.20       99.24
          2 |         52        0.52       99.76
          3 |         24        0.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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