I am new to this forum but have found several threads to be highly useful so am posing a question myself.
My data was collected (fish length = factor, fish mercury = response) from several rivers over several years for the purpose of environmental (mercury) monitoring.
What I would like to do is, using the data I have, perform power analysis to determine how many samples should be collected in the future to get the same results. The purpose is to recommend the least number of samples necessary (thus killing the least number of fish). Is this possible and does anyone have a recommendation on how to go about this?
Much thanks in advance!