Non-parametric tests Flashcards
what are non-parametric tests for
Non-normal data
what are the two non-parametric tests and difference between them
Whitney U test - for two samples
Krustal-Wallis test - for more than 2 samples
what is the Krustal-Wallis test equivalent to
non-parametric equivalent to analysis of varience
what is the whitney U test equivalent to
non- para equivalent to t test
can these tests be used for normal data
yes, but lack power
how can you transform data to make it normal
take the values and convert them to logarithms - this pulls the high values towards the main body of the data
what are paired tests
when the data is coming in pairs - its the same animal before and after treatment
what does a paired test do
removes variation before test and focuses on what effect the treatment had
what is the name for the paired test for non-normal data
wilcoxen signed rank test
