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

   ROLLOVER |
       TYPE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,887       68.87       68.87
          1 |      1,656       16.56       85.43
          2 |        550        5.50       90.93
          9 |        136        1.36       92.29
          . |        771        7.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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