Non-parametric tests & transformation
6 important questions on Non-parametric tests & transformation
What are the most common transformations in ecology?
- If s^2 > mean: log (growth, biomass)
- if s^2 = mean: sqrt (area, size)
What do you do if there is a zero in your dataset?
(+0.5 if you are doing the square root)
What do you do if it is impossible to transform you data to a normal distribution?
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When do you use a Wilcoxon matched pairs test?
- Not normal distribution
- Matched pairs (measuring chick weight twice, a couple weeks apart)
How do you illustrate not normally distributed data?
The shape of the boxplot represents the distribution of your data.
What do parametric tests assume?
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