Frequencies for first 10,000 rows of retprn variable in nhamcsopd1992 dataset :

  Return to |
  clinic if |
    needed, |
     P.R.N. |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,724       87.24       87.24
          1 |      1,276       12.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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