Frequencies for first 10,000 rows of prov2210 variable in pos2002 dataset :

       srv: |
 laboratory |
 (clinical) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,812       88.12       88.12
          0 |         10        0.10       88.22
          1 |        847        8.47       96.69
          2 |        241        2.41       99.10
          3 |         90        0.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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