Advanced placement (AP) and concurrent enrollment (CE) provide high school students with rigorous coursework and possible college credit. Theoretical modeling predicted students would substitute CE for AP courses conditional on their probability of earning university credit, passing AP tests, and college selectivity despite CE costing more than AP. In the current study, CE costs to families drop to zero and students should be expected to maximize substitution. This study uses multiple years of school-level data from Colorado, a state with a growing CE sector to test substitution effects. Using a school fixed-effect Poisson regression of the most commonly taken AP exams, results indicate limited evidence of widespread substitution. The continued preference for AP may increase costs to families and reduce potential college credits.

高级分班（AP）和同时入学（CE）为高中学生提供严格的课程学习和可能的大学学分。理论模型预测，尽管CE的费用要比AP高，但学生将获得CE的资格，通过AP的测试和大学的选择性，从而可以将CE替换为AP的课程。在当前的研究中，家庭的CE成本降至零，应该期望学生能够最大限度地替代。这项研究使用了科罗拉多州（CE）部门不断发展的科罗拉多州的多年学校水平数据来测试替代效果。使用最常参加的AP考试的学校固定效应Poisson回归，结果表明广泛替代的证据有限。继续偏爱AP可能会增加家庭成本，并减少潜在的大学学分。