Frequencies for first 10,000 rows of prov2355 variable in pos1998 dataset :

       srv: |
 outpatient |
    surgery |
       unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,805       88.05       88.05
          0 |        542        5.42       93.47
          1 |        608        6.08       99.55
          2 |         29        0.29       99.84
          3 |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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