Routine water quality data are used in the U.S. by state agencies for assessing environmental standard compliance. Frey et al. [2011] collected water quality and biological monitoring data from wadeable streams in watersheds surrounding the Great Lakes to understand the impact of nutrient enrichment on stream biological communities. Because sample sizes for different streams vary […]
Consider the model you developed in question 8 of Chapter 8 and perform a simulation to see if the model you developed adequately describes the response variable data distribution. A potential problem with this data set is the limited variability in the response variable. This could be caused by the difficulty in accurately recording the […]
Qian et al. [2003a] proposed a “nonparametric deviance reduction†method for detecting ecological threshold. The method is based on the CART model, but uses only one predictor representing the environmental gradient. The first split point is used as the threshold. In the paper, the authors suggested that a χ 2 test can be used to […]
Many institutions around Lake Erie have long-term water quality monitoring programs. These institutions, however, use several different water sampling methods and several chemical analytical methods for measuring water quality variables. The data file Eriecombined.csv include monitoring data from six institutions collected from 2010 to 2013. Figure 3.4 shows data from NOAA. One way to examine […]
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