Frequencies for first 10,000 rows of prov2210 variable in pos2008 dataset :

       srv: |
 laboratory |
 (clinical) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,655       86.55       86.55
          0 |         49        0.49       87.04
          1 |        918        9.18       96.22
          2 |        250        2.50       98.72
          3 |        128        1.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017