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

   Rollover |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,932       69.32       69.32
          1 |      1,021       10.21       79.53
          2 |      1,271       12.71       92.24
          . |        776        7.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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