Frequencies for first 10,000 rows of prov2210 variable in pos2000 dataset :

       srv: |
 laboratory |
 (clinical) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,871       88.71       88.71
          0 |          8        0.08       88.79
          1 |        811        8.11       96.90
          2 |        227        2.27       99.17
          3 |         83        0.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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