Frequencies for first 10,000 rows of prov2210 variable in pos2005 dataset :

       srv: |
 laboratory |
 (clinical) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,731       87.31       87.31
          0 |         19        0.19       87.50
          1 |        889        8.89       96.39
          2 |        246        2.46       98.85
          3 |        115        1.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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