Frequencies for first 10,000 rows of prov2205 variable in pos2002 dataset :

       srv: |
 laboratory |
(anatomical |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,812       88.12       88.12
          0 |        391        3.91       92.03
          1 |        377        3.77       95.80
          2 |        362        3.62       99.42
          3 |         58        0.58      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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