mann whitney U, t-test or spearmans ranks?
i did a belt transect of 20 metres, 20 readings, also took soil temperature and above ground temperature.
i also have 3 soil samples at 0m, 10m, and 20m.
i can't remember which one i have to do..?
thanks in advance
PS my investigation is too see if biological and other factors affect the species density of birdsfoot trefoil away from a group of trees..
i think it is spearman's rank but i'm not certain.
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which statistical test am i doing? (super quick) watch
- Thread Starter
- 26-08-2005 16:40
- 27-08-2005 17:16
you can't use mann whitney u test because you have 3 groups of data, and mann whitney only tests differences in two sets of data.
spearman only tests linear correlation.
t-test is similar to mann whitney but t-test needs a large sample.
hope that helps.