Frequencies for first 10,000 rows of admitobs variable in nhamcsed2001 dataset :

  admit for |
      23 hr |
observation |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,930       99.30       99.30
          1 |         70        0.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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