Frequencies for first 10,000 rows of optmtrc_srvc_cd variable in pos1992 dataset :

       srv: |
 optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,851       88.51       88.51
          0 |        989        9.89       98.40
          1 |         92        0.92       99.32
          2 |         60        0.60       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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