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What criteria are used to linearize data before non-linear regression?

In my lab's kinetic studies, we often debate whether to fit non-linear models directly or to transform the data for linear regression. The textbooks list methods, but I'm looking for practical, experienced guidance on the trade-offs and decision factors in a research context.

 

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By Shreya K Answered 1 year ago

Based on my extensive work in chemometrics, I recommend linearization primarily for exploratory analysis or when you need ultra-simple, transparent initial estimates. The key consideration is error structure: linearization distorts the inherent noise. If your original data has constant variance, a log transform will change that, violating ordinary least squares assumptions. So, my rule is: use it to get a quick visual fit and starting guesses for parameters. However, for final, publishable results, I always switch to direct non-linear regression. It respects the true error distribution and provides statistically valid confidence intervals, which linearized fits often corrupt.

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