Billinear curve fit of pushover curve

I am trying to make a billinear curve fit and ask chat gpt to do it. Hehehhe

But it not running. Can someone check and improve this.

[Image Analyst]

Can you put a little more effort into your post, like for example show a screenshot of your data plotted?

[Mark Cuanan]

This is an example. The blue is the data from the excel. This is the capacity curve. The red one is the billinear curve fit. You maY also open the script in my post. There is a step procedure there. Thanks

[John D'Errico]

You have posted the same question 7 times. This is becoming spam on the forum.