Why don't create artificial data?

E.g. (in R): for some range of x:

y

Thanks for you answer. But, I need real data sets.

Dear Serhii,

In the public domain, for example, see the links below.

Article An empirical study of maintenance and development estimation accuracy

Article CONSTRUCTING THE TRANSFORMED PREDICTION ELLIPSES ON THE BASI...

Article Estimating LOC for information systems from their conceptual...

https://www.researchgate.net/post/transformation_of_data_for_normality

Dear Sergiy Prykhodko, I'm very grateful for your help.