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

       srv: |
 laboratory |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,408       84.08       84.08
          0 |      1,169       11.69       95.77
          1 |         69        0.69       96.46
          2 |        343        3.43       99.89
          3 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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