Frequencies for first 10,000 rows of psychlgcl_srvc_cd variable in pos2000 dataset :

       srv: |
psychologic |
         al |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,921       99.21       99.21
          0 |         30        0.30       99.51
          1 |         12        0.12       99.63
          2 |         19        0.19       99.82
          3 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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