Frequencies for first 10,000 rows of lab_srvc_cd variable in pos2000 dataset :

       srv: |
 laboratory |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,917       79.17       79.17
          0 |      1,219       12.19       91.36
          1 |        132        1.32       92.68
          2 |        709        7.09       99.77
          3 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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