Prism provides lots of built-in models, but you should not hesitate to adapt these or enter additional models. This section shows you how to do so.

•Overview: User-defined equations

•How to: Enter a new equation

•How to: Clone an equation

•How to: Manage your list of equations

•Syntax of user-defined equations

•Multiline models

•Limitations when entering equations

•Entering a differential equation

•Entering an implicit equation

•Available functions for user-defined equations

•Fitting different segments of the data to different models

•Fitting different models to different data sets

•Column constants

•Defining equation with two (or more) independent variables

•Rules for initial values

•Default constraints

•Transforms to report