Simple diagramm with 3 variables

Hi guys!

I actually have a pretty simple question.

How do I get a plot drawn with R as I have shown in the figure?

I have already tried with various codes (boxplot, etc..) but never get the right result.

Could someone help me?

Thanks in advance

Michael

Hi!

To help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one: