Frequencies for first 10,000 rows of prov2210 variable in pos2010 dataset :

       SRV: |
 LABORATORY |
 (CLINICAL) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,626       86.26       86.26
          0 |         60        0.60       86.86
          1 |        906        9.06       95.92
          2 |        262        2.62       98.54
          3 |        146        1.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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