I have a friend who is an MD and wants to refresh his Statistics. So is there any recommended resource online (or offline) ? He did stats ~20 years ago.
This is one I've used successfully:
I just stumlbed on this too, this might be useful:
I'm sure I knew of a free pdf that some doctors I know use, but I can't seem to find it at the moment. I will try to dig it out.
My book, Intuitive Biostatistics, is written partly from a medical point of view. It focusses on the practical parts of interpreting statistical results, with almost no math.
I assume your friend prefers something that's biostatistics oriented. Glantz's Primer of Biostatistics is a small book, an easy and quick read, and tends to get rave reviews from a similar audience. If an online reference works, I like Gerard Dallal's Handbook of Statitical Practice, which may do the trick if he's just refreshing previous knowledge.