Frequencies for first 10,000 rows of lab_srvc_cd variable in pos2003 dataset :

       srv: |
 laboratory |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,568       75.68       75.68
          0 |      1,317       13.17       88.85
          1 |        151        1.51       90.36
          2 |        929        9.29       99.65
          3 |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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