Frequencies for first 10,000 rows of psychlgcl_srvc_cd variable in pos2003 dataset :

       srv: |
psychologic |
         al |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,880       98.80       98.80
          0 |         65        0.65       99.45
          1 |         12        0.12       99.57
          2 |         21        0.21       99.78
          3 |         22        0.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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