Hi, i am trying to compare the dietary compositions of two groups, using just 2 isotopes (d13C, and d15N), should be very straightforward. I noticed that when I run the groups individually I get very different results than running them together. Is one way fundamentally better than the other? Thanks in advance!
Running the two groups separately is statistically equivalent to testing for interaction effects (also known as moderation). So, if you have other independent variables in your equation, their effects differ between your groups.
David L Morgan thank you for your answer! I am still a little confused though. So if I didn't specifically put in any independent variables, the results should not differ too much right? I am running the two groups using the exact same set of everything (concentration, fractionation, etc). In this case would you just recommend running them separately and compare the results "posteriorly"?
I don't understand what you mean by "running the groups separately" if there weren't any independent variables (other than the experimental condition).
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