Frequencies for first 10,000 rows of lab_srvc_cd variable in pos2008 dataset :

       srv: |
 laboratory |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,755       77.55       77.55
          0 |      1,513       15.13       92.68
          1 |         76        0.76       93.44
          2 |        595        5.95       99.39
          3 |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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