Frequencies for first 10,000 rows of prov2210 variable in pos2003 dataset :

       srv: |
 laboratory |
 (clinical) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,789       87.89       87.89
          0 |         10        0.10       87.99
          1 |        855        8.55       96.54
          2 |        246        2.46       99.00
          3 |        100        1.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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