Frequencies for first 10,000 rows of avdifsfstr variable in nsrd dataset :

 avdifsfstr |      Freq.     Percent        Cum.
------------+-----------------------------------
          I |        798        7.98        7.98
          J |      9,202       92.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016