Frequencies for first 10,000 rows of rollover variable in person dataset :

   rollover |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,661       66.61       66.61
          1 |      1,096       10.96       77.57
          2 |      1,597       15.97       93.54
          . |        646        6.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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