Frequencies for rollover variable in person dataset :

   rollover |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        828       76.88       76.88
          1 |          8        0.74       77.62
          2 |         48        4.46       82.08
          . |        193       17.92      100.00
------------+-----------------------------------
      Total |      1,077      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016