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Many researchers use nonlinear regression more than any other statistical tool.
Despite this popularity, there are few places to learn about nonlinear regression. Most introductory statistics books ignore nonlinear regression, and advanced statistics books exceed the mathematical sophistication of many scientists. Much of the information on this site will be useful no matter what program you use for nonlinear regression. Prism is particularly easy to use, and it combines nonlinear regression with scientific graphics and statistics. You can download the entire book as a pdf file.