Frequencies for first 10,000 rows of attend variable in natl1975 dataset :

  Person in |
 Attendance |
 (Effective |
      1975) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,663       96.63       96.63
          2 |        262        2.62       99.25
          9 |         75        0.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016