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

   rollover |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,967       69.67       69.67
          1 |        933        9.33       79.00
          2 |      1,266       12.66       91.66
          . |        834        8.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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