Frequencies for first 10,000 rows of prov4235 variable in posclia2009 dataset :

  number of |
       labs |
   directly |
 affiliated |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,442       84.42       84.42
          1 |        749        7.49       91.91
          2 |        399        3.99       95.90
          3 |        193        1.93       97.83
          4 |        147        1.47       99.30
          5 |         40        0.40       99.70
          6 |          8        0.08       99.78
          7 |         12        0.12       99.90
          8 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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