Frequencies for first 10,000 rows of attend variable in natl1980 dataset :

  Person in |
 Attendance |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,837       98.37       98.37
          2 |        129        1.29       99.66
          3 |         30        0.30       99.96
          9 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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