[R] Levene's test for homogeneity of variances (befor using ANOVA)

Dear all I have tried to find this function in R, but don't find it by searching in the help function. Anybody who knows if R has the function "Levene's test for homogeneity of variances"? Note: Im a "R-begginer" Regards Kes [[alternative HTML version deleted]] ___

[R] Does the t.test in R uses Welch procedure or ordinary student t-test?

Dear all I have run t.test(), and get a output similar to this: t.test(extra ~ group, data = sleep) Welch Two Sample t-test data: extra by group t = -1.8608, df = 17.776, p-value = 0.0794 alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval:

[R] Is there a simple way to use one-way ANOVA comparing the means of groups?

Dear all, I have finally managed to get a "Analysis of Variance Table": Response: LogHand Df Sum Sq MeanSq F valuePr(>F) Prey35.3125 1.7708 20.6722.066e-11 *** Residuals 16414.0488 0.0857 I want to compare the me

[R] How to run one-way anova R?

Dear all, How do I run a basic one-way anova in R? Regards Kes [[alternative HTML version deleted]] __ 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/pos

[R] Testing for differecnes between groups, need help to find the right test in R.

Dear all, I have a data set with four different groups, for each group I have several observation (number of observation in each group are unequal), and I want to test if there are some differences in the values between the groups. What will be the most proper way to test this in R? Regards Kes