Frequencies for first 10,000 rows of cl_srvc_cd variable in pos2012 dataset :

   Services |
  Provided: |
   Clinical |
 Laboratory |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,606       86.06       86.06
          0 |         65        0.65       86.71
          1 |        891        8.91       95.62
          2 |        266        2.66       98.28
          3 |        172        1.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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