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

       SRV: |
 LABORATORY |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,950       79.50       79.50
          0 |      1,419       14.19       93.69
          1 |         77        0.77       94.46
          2 |        514        5.14       99.60
          3 |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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