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Theory Manual Version 3.6
 Chapter 8: Optimization Up Chapter 8: Optimization Section 8.2: The Levenberg-Marquardt Method 

8.1 The Objective Function

The objective function, which is to be minimized, can be defined as follows,
Here, the are user-defined data pairs and is the function that extracts the corresponding data from the model. The optimization module tries to find the model parameters a that minimize the function . It does this by repeatedly evaluating the function , which will usually call FEBio to solve a forward FE problem.
 Chapter 8: Optimization Up Chapter 8: Optimization Section 8.2: The Levenberg-Marquardt Method