Frequencies for first 10,000 rows of lab_srvc_cd variable in pos1996 dataset :

       srv: |
 laboratory |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,045       80.45       80.45
          0 |      1,281       12.81       93.26
          1 |        123        1.23       94.49
          2 |        529        5.29       99.78
          3 |         22        0.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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