Frequencies for first 10,000 rows of prov2205 variable in pos1993 dataset :

       srv: |
 laboratory |
(anatomical |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,856       88.56       88.56
          0 |        311        3.11       91.67
          1 |        432        4.32       95.99
          2 |        348        3.48       99.47
          3 |         53        0.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016