Frequencies for first 10,000 rows of prov2525 variable in pos2001 dataset :

      spec: |
   thoracic |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,267       92.67       92.67
          N |        685        6.85       99.52
          Y |         48        0.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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