Frequencies for first 10,000 rows of op_srgry_unit_srvc_cd variable in pos1992 dataset :

       srv: |
 outpatient |
    surgery |
       unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,851       88.51       88.51
          0 |        542        5.42       93.93
          1 |        571        5.71       99.64
          2 |         28        0.28       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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