Frequencies for first 10,000 rows of nursemid variable in nhamcsopd1999 dataset :

      nurse |
    midwife |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,877       98.77       98.77
          1 |        123        1.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016