is there a statistical test for this

[gowther]

I want to know if there is a statistical difference between the 2 sets of data. Red and black are cateegorical variables which are unknown if they affect y. Time is known to affect y.

 

[hlsmith]

Would it be acceptable to fit a line to data?

 

[Karabiner]

I want to know if there is a statistical difference between the 2 sets of data.

Could you tell us something about the research questions, the variables included, the study design, and the sample size(s)?

With kind regards

Karabiner