import("AER")
import("Formula")

importFrom("lmtest", "coeftest")
importFrom("sandwich", "vcovHC")
importFrom("grDevices", "dev.new", "gray")
importFrom("graphics", "abline", "axis", "image", "layout", "mtext",
           "par", "plot", "rect", "segments", "text", "title")
importFrom("stats", ".getXlevels", "delete.response", "lm", "lm.fit",
           "lm.wfit", "model.matrix", "model.offset", "model.response",
           "model.weights", "pnorm", "qt", "terms", "update")
			 
export("ivreg.EX", "ivreg.fit.EX", "coeftestIV", "plot_confregion", "sensIvreg", "senslm")

S3method("sensIvreg", "ivreg")
S3method("sensIvreg", "ivregEX")
S3method("plot", "ivregDecision")
S3method("plot", "ivregDecisionList")
S3method("plot", "sensIvregEX")
S3method("plot", "si")
S3method("print", "ivregDecision")
S3method("print", "si")
