Frequencies for first 10,000 rows of benefittype variable in ma2011 dataset :

                   Benefit Type |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
                                |      5,088       50.88       50.88
Actuarially Equivalent Standard |        179        1.79       52.67
              Basic Alternative |        998        9.98       62.65
       Defined Standard Benefit |      1,187       11.87       74.52
           Enhanced Alternative |      2,548       25.48      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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