Frequencies for first 10,000 rows of crdvsclr_srgry_sw variable in pos1996 dataset :

      spec: |
cardiovascu |
        lar |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,497       94.97       94.97
          N |        467        4.67       99.64
          Y |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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