Definition Of Self Selection Bias - 751 Words

1. â€Å"Self-selection bias† is a bias that occurs when people select themselves into a group resulting in a biased sample such as the school lotteries where only those students are enrolled who (or whose parents) chose to. Kahlenberg and Potter warned the readers about â€Å"self-selection bias† in Smarter Charter, and stated that many national studies about the effectiveness of charter schools are not controlled for self-selection bias, therefore, their results do not provide an adequate portrayal about charter schools (Kahlenberg and Potter, p. 70). â€Å"Self-selection bias† also appeared in Jacqueline Rabe Thomas’s article â€Å"State Report: Students in Desegregated Schools Test Higher.† Thomas provided evidence for the fact that students enrolled in desegregated magnet schools perform higher than students enrolled in traditional schools, and made the conclusion that desegregated schools are better than non-segregated schools. However, Thomas failed to control for self-selection bias in the study she examined. She states that only two out of 25 students were not proficient in reading in a magnet school and 12 out of 25 students were not proficient in traditional schools, and â€Å"for Hartford residents who enroll in a suburban school through the Open Choice program, seven of 25 students in fifth grade were not proficient. Students are accepted into these schools through a blind lottery operated by the state† (Thomas). The study did not give any attention to the fact that those students whoShow Mor eRelatedWhat Do Fishermen Tell Us That Taxi Drivers Don T? An Empirical Investigation Of Labor Supply Essay1620 Words   |  7 Pagessupply studies because of the complete panel data it applies and the method controlling estimations issues it applies, while most studies do not. Those concerns includes endogeneity of wage and measurement errors, especially on observed wage and self-selection. 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