Az Ha wrote: > > I have a set of data where two groups of animals walk around in an > environment and I have calculated the percentages of the area covered by > them. Each group covers different area, for example the arithmetic mean is > 35% and 23% with n=40 and 29 respectively. > ... > Should i use unpaired T-test or prop.test? > .. >
Distribution questions aside, you should also consider what your story is. >From the animal's viewpoint, a doubling from 1% to 2% is as good as one from 30% to 60%, so the proportion is the measure of success. If you are an ecologist, a change in population from 30% to 60% might be close to disaster for the environment, so percentage points (60-30) or (2-1) is the right choice. Dieter -- View this message in context: http://r.789695.n4.nabble.com/Should-I-use-T-test-or-prop-test-tp3171191p3171644.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
