update NEWS; add AIC-order tests

Author: bbolker

inst/NEWS.Rd

@@ -4,15 +4,17 @@
 \title{bbmle News}
 \encoding{UTF-8}
 
-\section{Changes in version 1.0.19.9000 (devel)}{
+\section{Changes in version 1.0.20 (2017-10-30)}{
   \subsection{BUG FIXES}{
     \itemize{
       \item fixed buglet: flipped profile plot axes, confint for negative values
     }
   }
   \subsection{USER-VISIBLE CHANGES}{
     \itemize{
-      \item \code{summary.mle2} is now exported, for use by other packages
+      \item \code{summary.mle2} is now exported, for use by other
+      packages
+      \item small fixes to AIC(c) methods 
     }
   }
 }

tests/ICtab.R

@@ -15,3 +15,15 @@ m3 <- glm(z~1,family=quasipoisson)
 aa <- AICtab(m1,m2,m3,weights=TRUE)
 stopifnot(any(!is.na(aa$dAIC)),
           any(!is.na(aa$weight)))
+
+set.seed(101)
+x <- rnorm(100)
+dd <- data.frame(y=rnorm(100,2+3*x,sd=1),x)
+m4A <- lm(y~x,dd)
+m4B <- mle2(y~dnorm(mean=a+b*x,sd=exp(logsd)),
+           data=dd,
+           start=list(a=1,b=1,logsd=0))
+## cosmetic differences only
+stopifnot(all.equal(AIC(m4A,m4B)[,"AIC"],
+                    AIC(m4B,m4A)[,"AIC"]))
+