Frequencies for first 10,000 rows of prov2210 variable in pos2006 dataset :

       srv: |
 laboratory |
 (clinical) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,710       87.10       87.10
          0 |         26        0.26       87.36
          1 |        908        9.08       96.44
          2 |        245        2.45       98.89
          3 |        111        1.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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