Frequencies for first 10,000 rows of benefittype variable in ma2013 dataset :

                   Benefit Type |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
                                |      5,638       56.38       56.38
Actuarially Equivalent Standard |        156        1.56       57.94
              Basic Alternative |        942        9.42       67.36
       Defined Standard Benefit |        920        9.20       76.56
           Enhanced Alternative |      2,344       23.44      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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