I'm testing correlation between two variables v1
and v2
, but they are clustered by a third variable group
. Can I directly use the correlation test (i.e., Spearman test) without accounting the cluster? What is the possible issue? If not, what test should I conduct? Is intraclass correlation the correct test I should use? My data are not normally distributed.
I have 2 sets of data, they have 40, 80 group
. My group is subject, and v1
and v2
are two continuous variables that are two different behavioural data drawn from each individual.
example data
group v1 v2
1 2 1
1 2 0
1 8 9
2 7 1
2 9 2
2 3 1
3 2 2
3 1 1
3 1 2
Thanks!
v1
andv2
(if any), and what type of data are they ? $\endgroup$