search for: bonferonni

...d compiling the results of 7 tests, for which one of these tests the variances are unequal. I wish to perform an ANOVA between the three groups but for the one test with unequal variance (<0.001 by both bartlett and levene's test) I am not sure what to do. I thought i would run ANOVA with bonferonni post-test for groups with equal variances, then for the test with unequal variance i would use the welch correction and games-howell post-test. Does this sound reasonable? Someone has also recommended to me to use Kruskal-wallis ANOVA, then use Wilcoxon sign rank test pairwise to determine which...

...and degrees of freedom (in addition to the coefficients) and have them appear as rows in the output? Ultimately, I have 200+ groups that I am running regressions on in the same dataset, so I need some way to extract the relevant information in a tabulated form. and no smart-alec comments about bonferonni corrections :) Thanks, Mike Michael Rennie Ph.D. Candidate University of Toronto at Mississauga 3359 Mississauga Rd. N. Mississauga, ON L5L 1C6 Ph: 905-828-5452 Fax: 905-828-3792

Hello, I am interested in parametric multi comparison tests such as Dunnett, Duncan, Tukey, Newman-Keuls, Bonferonni, Scheffe, and non-parametric tests such as Kruskal-Wallis, and Mann-Whitney U. Are there packages that include most of these tests in each category? Many packages exist for an individual test but their outputs vary in great detail (test statistics, p-values, etc.) formats. It is desirable to have...

...iment (briefly). I have a 2X2 factorial design with pH (5.5, 6.5) and local community (present, absent) as my treatments. I had plastic enclosures that I sampled across five weeks with the density of 7 species acting as my response variables. I'm analyzing one species at a time and doing Bonferonni corrections after the analysis. I've attached an example of one of my data files showing the treatments and the change in density (of one species) over 5 weeks. Hopefully someone can shed some light on this question: how to write a repeated measures ANOVA code in R? Thanks. Hope to hear...

A colleague was asking me if R does multi-level modelling as opposed to multiple regression. Since I have no knowledge of multi-level modelling (except 5 minutes googling ) I thought that I would as here. Does are offer any multi-level modeling packages? It looked like arm might be one but I was not sure. Thanks