Linear Mixed Model

#1
Hi,

Apologies if something similar has been posted before but I'm hoping somebody can help.
I have data from collected from different sites and some is paired and some is unpaired. Eg site one has timed method 1 for an image and timed method 2 for the same image. Site 2 has timed method 1 for an image and timed method 2 for a different image. Am I able to use a linear mixed models test to combine all of the data? I want to test the hypothesis that method 2 is better that method 1.

Thanks in advance for any replies

Thanks,
Zoe