Frequencies for first 10,000 rows of prov2355 variable in pos1995 dataset :

       srv: |
 outpatient |
    surgery |
       unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,933       89.33       89.33
          0 |        509        5.09       94.42
          1 |        524        5.24       99.66
          2 |         24        0.24       99.90
          3 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016