Frequencies for first 10,000 rows of prov6185 variable in pos2005 dataset :

 srv: shock |
       wave |
lithotripte |
          r |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,731       87.31       87.31
          0 |      1,261       12.61       99.92
          2 |          7        0.07       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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