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@techreport{NBERw9358,
 title = "An Evaluation of Instrumental Variable Strategies for Estimating the Effects of Catholic Schools",
 author = "Altonji, Joseph G and Elder, Todd E and Taber, Christopher R",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "9358",
 year = "2002",
 month = "December",
 doi = {10.3386/w9358},
 URL = "http://www.nber.org/papers/w9358",
 abstract = {Several previous studies have relied on religious affiliation and the proximity to Catholic schools as exogenous sources of variation for identifying the effect of Catholic schooling on a wide variety of outcomes. Using three separate approaches, we examine the validity of these instrumental variables. We find that none of the candidate instruments is a useful source of identification of the Catholic school effect, at least in currently available data sets},
}