Frequencies for first 10,000 rows of prov2525 variable in pos1998 dataset :

      spec: |
   thoracic |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,416       94.16       94.16
          N |        546        5.46       99.62
          Y |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016