Frequencies for first 10,000 rows of prov2205 variable in pos2005 dataset :

       srv: |
 laboratory |
(anatomical |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,731       87.31       87.31
          0 |        432        4.32       91.63
          1 |        395        3.95       95.58
          2 |        380        3.80       99.38
          3 |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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