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

   Rollover |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,080       70.80       70.80
          1 |        805        8.05       78.85
          2 |      1,317       13.17       92.02
          . |        798        7.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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