GPA  TUCE  PSI  GRADE
  2.66   20   0   0
  2.89   22   0   0
  3.28   24   0   0
  2.92   12   0   0
  4.00   21   0   1
  2.86   17   0   0
  2.76   17   0   0
  2.87   21   0   0
  3.03   25   0   0
  3.92   29   0   1
  2.63   20   0   0
  3.32   23   0   0
  3.57   23   0   0
  3.26   25   0   1
  3.53   26   0   0
  2.74   19   0   0
  2.75   25   0   0
  2.83   19   0   0
  3.12   23   1   0
  3.16   25   1   1
  2.06   22   1   0
  3.62   28   1   1
  2.89   14   1   0
  3.51   26   1   0
  3.54   24   1   1
  2.83   27   1   1
  3.39   17   1   1
  2.67   24   1   0
  3.65   21   1   1
  4.00   23   1   1
  3.10   21   1   0
  2.39   19   1   1
/*
Source: L. Spector and M. Mazzeo, "Probit Analysis and Economic Education,"
Journal of Economic Education, 1980,37-44.
Variables:
GPA = Grade point average.
TUCE = Score on a pretest.
PSI = Exposure to a new method of teaching economics (Yes=1, No=0).
GRADE = Grades improved (1) or not (0) after the exposure to PSI.
*/