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

   rollover |
       type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,077       70.77       70.77
          1 |      1,683       16.83       87.60
          2 |        206        2.06       89.66
          9 |         20        0.20       89.86
          . |      1,014       10.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016