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www/auxiliar_functions.R

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+library(ggplot2)
+
+dgamma_glm <- function(x, mu, phi) {
+  if (any(mu <= 0)) 
+    stop(paste("mu must be positive", "\n", ""))
+  if (any(phi <= 0)) 
+    stop(paste("phi must be positive", "\n", ""))
+  if (any(x < 0)) 
+    stop(paste("x must be positive", "\n", ""))
+  dgamma(x=x, shape=1/phi, scale=mu*phi)
+}
+
+dinvgaus_glm <- function(x, mu, phi) {
+  if (any(mu <= 0)) 
+    stop(paste("mu must be positive", "\n", ""))
+  if (any(phi <= 0)) 
+    stop(paste("phi must be positive", "\n", ""))
+  if (any(x < 0)) 
+    stop(paste("x must be positive", "\n", ""))
+  (2*pi*x^3*phi)^-0.5 * exp(-(x-mu)^2/(2*phi*x*mu^2))
+}