I'm in my 4th+ year of grad school in physics, working in the field of astrophysics. I've never taken an actual statistics course, and I'm starting to see the need for one - at the moment, I get all my statistics knowledge from Numerical Recipes. I do a lot of traveling for my research, so I can't take a course on campus. Can anyone recommend a good statistics textbook? I mainly need to learn about statistical tests that can be done in data analysis and numerical models. I have some background, just not an actual course, so it doesn't have to be an undergrad-level book if a more advanced one would be more appropriate. Thanks for any recommendations.