I have a multivariate data set, and I have performed the main analyses on it and am happy with the results.

Now, I took duplicate measurements for half of my samples, and what I want to do is determine how repeatable/accurate my measurements were - i.e. how similar the two duplicate measurements are, but only comparing the two measurements from a single sample with each other, and then looking at how similar the duplicate measurements were to the original ones across all the samples, if that makes sense.

If it was univariate data, I'd perform a matched pairs t test. But as it is multivariate (with LOTS of variables), I'm not sure what to do, can anyone help?

I've been using Primer-E for the rest of the analyses so if there's a routine I can use in that it would be easiest!

Thanks for any help.

Alex