Frequencies for first 10,000 rows of prov2205 variable in pos2004 dataset :

       srv: |
 laboratory |
(anatomical |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,766       87.66       87.66
          0 |        414        4.14       91.80
          1 |        383        3.83       95.63
          2 |        377        3.77       99.40
          3 |         60        0.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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