Frequencies for first 10,000 rows of orthtc_prsthtc_srvc_cd variable in pos1999 dataset :

       srv: |
orthotic/pr |
   osthetic |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,932       99.32       99.32
          0 |         45        0.45       99.77
          1 |          7        0.07       99.84
          2 |          7        0.07       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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