# Beginning with PEtab, only one entry per measurement?

**URL:** https://discourse.julialang.org/t/beginning-with-petab-only-one-entry-per-measurement/133388
**Category:** Modelling & Simulations
**Tags:** question
**Created:** [October 23, 2025, 2:11pm UTC](https://discourse.julialang.org/t/beginning-with-petab-only-one-entry-per-measurement/133388 "2025-10-23T14:11:20Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![kraqbi](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/kraqbi/32/206682_2.png) [@kraqbi](https://discourse.julialang.org/u/kraqbi)
#### Post date: [October 23, 2025, 2:11pm UTC](https://discourse.julialang.org/t/beginning-with-petab-only-one-entry-per-measurement/133388/1 "2025-10-23T14:11:20Z")

</div>

Hello,  
I try PEtab for the first time and I am studying the documentation and tutorial of PEtab.  
I was wondering, the DataFrame I create, is it absolutely necessary to have just one entry per measurement? There is no built-in feature to deal with a DataFrame with multiple measurements per entry?

I will deal with real biology data, so I was trying to figure out it there is a convenient way to process them. Or if I have to pre-process them.

Thanks!