Frequencies for first 10,000 rows of prov2525 variable in pos1999 dataset :

      spec: |
   thoracic |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,372       93.72       93.72
          N |        585        5.85       99.57
          Y |         43        0.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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