Since I have started studying Master's of Bioinformatics, I have ran into a lot of problems (coming to Bioinformatics with a Bachelor of Computer Science), therefore, grasping some topics has been a tough task for me. I am looking for books/resources that will help me learn the concepts/topics I am looking for. I have already Google'd a lot of things I have been looking for, but haven't found anything of value for a complete beginner. For instance, I haven't been able to find a proper source for teaching me how to calculate the CAI index, Odds Ratio, Viterbi, etc.

Any help, therefore, will be much appreciated.