exportPattern("^[[:alpha:]]+")
S3method(plot, givitiCalibrationBelt)
importFrom("grDevices", "gray")
importFrom("graphics", "arrows", "lines", "plot", "polygon", "text")
importFrom("stats", "as.formula", "binomial", "coef", "dchisq",
           "formula", "glm", "integrate", "logLik", "na.omit",
           "pchisq", "qchisq", "uniroot", "update", "vcov")
