Frequencies for first 10,000 rows of ab_nicu variable in natlterr2005 dataset :

  Admission |
  to NICU R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,255       62.55       62.55
          N |      3,532       35.32       97.87
          Y |        213        2.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015