Frequencies for first 10,000 rows of lab_srvc_cd variable in pos1994 dataset :

       srv: |
 laboratory |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,355       83.55       83.55
          0 |      1,115       11.15       94.70
          1 |         98        0.98       95.68
          2 |        416        4.16       99.84
          3 |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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