Dear Michael, Thanks for your answer. So, I'm not an expert in R and statistics, how can I create this interval of confidence of groups? Thanks Gc
Il giorno sab 22 dic 2018, 13:34 Michael Dewey <li...@dewey.myzen.co.uk> ha scritto: > Dear Giuseppe > > If I understand you correctly you have a very large sample size so it is > not surprising that you get very small p-values. Eevn a scientifically > uninteresting difference can become statistically significant with large > samples. You probably need to define a metric for meaningful differences > between groups and calculate a confidence interval for it. > > Michael > > On 21/12/2018 15:37, Giuseppe Cillis wrote: > > Dear all, > > I am a beginner with R (and also with the statistics) for which I hope to > > be clear. > > I should do this non-parametric test on data I extracted from maps. > > In practice I have a column that represents the landscape Dynamics of a > > certain time period (there are 3 dynamics, each of them marked by the > > number 1, 2 or 3) and the other column with the values of a topographic > > variable (for example the slope) . In all, there are more than 90,000 > pairs > > of values. > > Going to do the test in R, for all the dynamics and for all the > variables, > > I get out of the values of chi-square elevated (even in the order of > > thousands) and a p-value always <2.2e-16 .... why? Where can the error > be? in > > the script or in the test approach? > > Thanks in advance > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > > 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. > > > > -- > Michael > http://www.dewey.myzen.co.uk/home.html > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
