Frequencies for first 10,000 rows of benefittype variable in ma2012 dataset :

                   Benefit Type |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
                                |      5,234       52.34       52.34
Actuarially Equivalent Standard |        141        1.41       53.75
              Basic Alternative |        850        8.50       62.25
       Defined Standard Benefit |      1,281       12.81       75.06
           Enhanced Alternative |      2,494       24.94      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 14 Apr 2016