Tag Archives: nutrient

To Get Great (Statistical) Power, It Takes Great Responsibility

Image Credit: Miss Ophelia, Pixabay licence, Image Cropped

There are a lot of questions in ecological research that ask whether or not something has changed over time, or put more simply, whether two things are different – vegetation levels, climate variables, maybe species diversity.

Suppose we are monitoring nutrient levels in a lake to make sure they stay at levels that are habitable for the fish living there. A change in policy about what is allowed to be dumped into the river by local factories was enacted, and we want to see if there is evidence that the nutrient levels have deteriorated in the year following the change when compared to the year before. 

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