Frequencies for first 10,000 rows of ab_nicu variable in natl2013 dataset :

  Admission |
to NICU RFP |
630=f_ab_ni |
       cu R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,036       90.36       90.36
          U |        310        3.10       93.46
          Y |        654        6.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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