Frequencies for first 10,000 rows of prov2205 variable in pos1998 dataset :

       srv: |
 laboratory |
(anatomical |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,805       88.05       88.05
          0 |        341        3.41       91.46
          1 |        429        4.29       95.75
          2 |        371        3.71       99.46
          3 |         54        0.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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