Frequencies for first 10,000 rows of prov2205 variable in pos2001 dataset :

       srv: |
 laboratory |
(anatomical |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,837       88.37       88.37
          0 |        370        3.70       92.07
          1 |        383        3.83       95.90
          2 |        354        3.54       99.44
          3 |         56        0.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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