Frequencies for first 10,000 rows of ab_nicu variable in natlterr2009 dataset :

  Admission |
to NICU RFP |
630=f_ab_ni |
       cu R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,449       24.49       24.49
          N |      6,907       69.07       93.56
          U |          2        0.02       93.58
          Y |        642        6.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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