Errors in the Statistical Analysis

نویسنده

  • C. J. Schwarz
چکیده

Egri et al. (2012) investigated how the attractiveness of substrates to tabanids (horseflies) varied when painted with different numbers, orientation, and density of stripes. The basic experimental design was a randomized complete block design where the number of flies attracted was counted at regular intervals. The authors analyzed this data using a complete-randomized design ANOVA which is inappropriate as their analyses method did not match the design of the studies. The authors also used a simple χ test which, fortunately for the authors, is appropriate under a conditioning argument. However, their χ analysis cannot readily provide estimates of the effect sizes for the various factor. The appropriate analyses for these experiments is a generalized linear model assuming a Poisson distribution for the number of counts. We demonstrate the proper analyses of these experiments.

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تاریخ انتشار 2013