Density test Regression discontinuity design

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mccrary (2008) density test on data lee, moretti, , butler (2004).


mccrary (2008) suggested examining density of observations of assignment variable. if there discontinuity in density of assignment variable @ threshold treatment, may suggest agents able manipulate treatment status.


for example, if several students able mercy pass , there more students barely passed exam barely failed. similarly, if students allowed retake exam until pass, there similar result. in both cases, show when density of exam grades examined. gaming system in manner bias treatment effect estimate.








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