Table 2.

We consider four different categories of features as well as their combinations. The number in parenthesis denotes the number of features in the group.

Feature Set	Features
Time (1)	month of donation
Project (2)	eventual project success, project cost
Donor (10)	donation amount, donation includes optional support, distance to school, donation position (first, middle, last), donor photo published, donor teacher-referred, donor asked for student thank you notes
Teacher (8)	n-th project by teacher, completion and re- sponse time for confirmation note, impact letter, and student thank you notes, use of Facebook autopublish feature