Frequencies for first 10,000 rows of prov2355 variable in pos1991 dataset :

       srv: |
 outpatient |
    surgery |
       unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,770       87.70       87.70
          0 |        662        6.62       94.32
          1 |        539        5.39       99.71
          2 |         22        0.22       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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