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]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
