In the Kemp’s ridley turtle example, we tested whether the sex ratio has shifted. The data were observational, that is, turtles used in the data set were not randomly selected from the population, rather, these were turtles stranded on the beach. One particular feature of the data is the large difference in the number of […]
Problems of a significance test with a low power. Reproducible research findings are a cornerstone of the scientific method. However, studies have shown that results of published research can be difficult to replicate when only statistically significant results are published, particularly when the statistical significance tests are conducted with small sample sizes (hence with low […]
Eutrophication due to increased input of nitrogen in the Neuse River Estuary in eastern North Carolina, USA, was considered the primary cause of large scale fishkills in the late 1990s. The North Carolina General Assembly established laws to protect the estuary, including a requirement of reducing nutrient (particularly, nitrogen) input to the estuary. Because eutrophication […]
Harmel et al. [2006] compiled a cross-system data set to study the effects of agriculture activities on water quality. The data included in the study were mostly field scale experiments that measured nutrients (P, N) loading leaving a field. The data set (agWQdata.csv) includes the measured TP loading (TPLoad, in kg/ha), land use (LU), tillage […]
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