I bought this book hoping it would help me develop some R code for HMMs. I was completely fooled by the subtitle "An Introduction Using R". The book doesn't mention R at all until the appendix. The appendix has a jumbled collection of code fragments that might form a tiny basis for a larger code base. One is much better using existing HMM packages from the internet. I can only conclude that the "An Introduction Using R" is a marketing ploy. For shame.