Frequencies for first 10,000 rows of attend variable in natl1981 dataset :

  Person in |
 Attendance |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,886       98.86       98.86
          2 |         82        0.82       99.68
          3 |         24        0.24       99.92
          9 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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