ECON 151 Lecture Notes - Lecture 53: Miscarriage, Random Assignment, Highscope
4 Dec 2020
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One miscarriage, the other withdrew at birth (120 kids); Then 9 did not accept their random assignment: some parents refused to send their kids to treatment (7) 2 other were unhappy to be in control (111 obs); At age 8, only 93 kids were still in the sample, but only 90 were measured. At age 15, 93 kids were tests, again very high attrition rate probably not fully random. Reference: lifetime effects: the high/scope perry preschool study through age 40. 60"s in michigan first rct to test the impact of a preschool program; Identified 123 low-income african-american in michigan (ypsilanti, detroit outskirt) 58 assigned to treatment, rest to control. Data were collected at age: 3 -11 and then 14,15,19,27 and 40. started at age 3 and during. 2. 5-hour preschool program on weekdays during the school year, supplemented by weekly home visits by teachers. 123 is randomized but you can just be lucky in terms of comparing effects,
