Frequencies for first 10,000 rows of prov2205 variable in pos1997 dataset :

       srv: |
 laboratory |
(anatomical |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,792       87.92       87.92
          0 |        352        3.52       91.44
          1 |        432        4.32       95.76
          2 |        375        3.75       99.51
          3 |         49        0.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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