# Fitting system of ODEs to already normalized data

**URL:** <https://discourse.julialang.org/t/fitting-system-of-odes-to-already-normalized-data/117400>\
**Category:** Modelling & Simulations\
**Tags:** optimization, fit\
**Created:** [July 23, 2024, 10:29pm UTC](https://discourse.julialang.org/t/fitting-system-of-odes-to-already-normalized-data/117400 "2024-07-23T22:29:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Nick1](https://avatars.discourse-cdn.com/v4/letter/n/47e85d/32.png) [@Nick1](https://discourse.julialang.org/u/Nick1)\
**Post date:** [July 23, 2024, 10:29pm UTC](https://discourse.julialang.org/t/fitting-system-of-odes-to-already-normalized-data/117400/1 "2024-07-23T22:29:29Z")

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I have a system of ODEs as a model and want to calibrate it. I have data for multiple outputs of the model but they are already normalized. Since I am unfamiliar with the related packages in Julia, what would you recommend using? Also, does the use of normalized data make the model unsuitable for predictions?

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**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [July 26, 2024, 1:34pm UTC](https://discourse.julialang.org/t/fitting-system-of-odes-to-already-normalized-data/117400/2 "2024-07-26T13:34:27Z")

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Solve the whole time series and then normalize it in the loss function?