Hi all:

There was a concern raised by reviewers of a manuscript of mine over the
proper execution of a Pearson's correlation. In brief, this was undertaken
in order to determine the relationship between the extent of wheel running
(y axis) and ethanol intake (x axis) across three, separate 10 day periods
in 7 animals.

In the paper, the correlational plots for each 10 day-period had 70 data
points: One point for each day and each animal across 10 days of
experimentation. The reviewers, however, appropriately pointed out that
this is a violation of the assumption of sample independence for Pearson's
test, and I should have had only 7 points, which would reflect the means of
my two variables for each individual animal across 10 days. Is this
appropriate or is there a means of accounting for repeated sampling with a
correlation test?

-
Justin Montemarano
Graduate Student
Kent State University - Biological Sciences

http://www.montegraphia.com

	[[alternative HTML version deleted]]

