Frequencies for first 10,000 rows of prov2205 variable in pos1991 dataset :

       srv: |
 laboratory |
(anatomical |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,770       87.70       87.70
          0 |        306        3.06       90.76
          1 |        481        4.81       95.57
          2 |        403        4.03       99.60
          3 |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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