add persistance model

[peterdudfield]

Pull Request

Description

Add persistence model in ESO analysis

Fixes #

How Has This Been Tested?

I have run the notebook

• [ ] No
• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked my code and corrected any misspellings

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