Table 1.

The average impact of being assigned to double-dose algebra

	2003		2004
Outcomes	Estimate	SE	Estimate	SE
Total semesters
Control mean	9.082***	0.220	9.496***	0.371
Treatment effects: all students	0.468***	0.138	−0.055	0.147
20% bandwidth	0.427**	0.201	0.043	0.224
10% bandwidth	0.540**	0.258	−0.156	0.261
Any degree/certificate
Control mean	0.146***	0.018	0.141***	0.028
Treatment effects: all students	0.034**	0.014	0.017	0.013
20% bandwidth	0.031*	0.017	0.001	0.017
10% bandwidth	0.032	0.021	−0.010	0.020
4-y degree
Control mean	0.070***	0.013	0.084***	0.023
Treatment effects: all students	0.033***	0.012	0.007	0.009
20% bandwidth	0.025*	0.013	−0.021	0.012
10% bandwidth	0.026*	0.015	−0.023	0.015
No. of students
All students	19,800		20,491
20% bandwidth	10,286		10,418
10% bandwidth	5,368		5,408
No. of schools	62		66

***P < 0.01, **P < 0.05, *P < 0.1.