Frequencies for first 10,000 rows of psychlgcl_srvc_cd variable in pos2007 dataset :

       srv: |
psychologic |
         al |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,861       98.61       98.61
          0 |         81        0.81       99.42
          1 |         14        0.14       99.56
          2 |         23        0.23       99.79
          3 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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