Stochastic processes are tools used widely by statisticians and researchers working in the mathematics of finance. This book for self-study provides a detailed treatment of conditional expectation and probability, a topic that in principle belongs to probability theory, but is essential as a tool for stochastic processes. The book centers on exercises as the main means of explanation.
As an instructor, I found this book really helpful as complementary material. But, I would not recommend it for independent study: There are too many ideas that are almost self-evident if you already know the material but if you try to understand the subject for the first time, those ideas are sorely missing.