Hi Sam,

> Hi, the question may be a bit weird, but how do you define 'over-fitting'
> in the context of structure refinement? From users' perspective the
> practical aspect is to 'fit' the model into the density. So there comes
> this question from our juniors: fit is fit, how is a model over-fit?
>

this is a good question for which there is an answer. I suggest reading
classics on the matter:

https://www.nature.com/articles/355472a0
https://atbweb.stanford.edu/atb_publications/brunger_kleywegt_struct_1996.pdf
https://www.sciencedirect.com/science/article/pii/S0076687997770216
https://pubmed.ncbi.nlm.nih.gov/15299543/
https://journals.iucr.org/d/issues/1998/04/00/ad0030/ad0030.pdf

and numerous references therein. That should set the scene for the next
questions to ask.

Good luck!
Pavel

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