REndo: Fitting Linear Models with Endogenous Regressors using Latent Instrumental Variables

Fits linear models with endogenous regressor using latent instrumental variable approaches. The methods included in the package are Lewbel's (1997) <doi:10.2307/2171884> higher moments approach as well as Lewbel's (2012) <doi:10.1080/07350015.2012.643126> heteroskedasticity approach, Park and Gupta's (2012) <doi:10.1287/mksc.1120.0718>joint estimation method that uses Gaussian copula and Kim and Frees's (2007) <doi:10.1007/s11336-007-9008-1> multilevel generalized method of moment approach that deals with endogeneity in a multilevel setting. These are statistical techniques to address the endogeneity problem where no external instrumental variables are needed. This version: - solves an error occurring when using the multilevelIV() function with two levels, random intercept. - returns the AIC and BIC for copulaCorrection() (method 1) and latentIV() methods. - residuals and fitted values can be saved by users for latentIV() and copulaCorrection() methods. - improves the summary methods for copulaCorrection() and multilevelIV() functions.

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