[R] Levene's test output

2013-06-21 Thread pieter
Hey, I don't really get the output of the performed Levene's test. So in short. two data sets, one with 75 elements, one with 283. And I want to check whether they have the same variance. I did a LeveneTest And this is the output: Levene's Test for Homogeneity of Variance (center = median)

Re: [R] Levene's test output

2013-06-21 Thread S Ellison
I don't really get the output of the performed Levene's test. One answer would be to read John Fox's rather good book, for which car is the corresponding R package. Another is to look up leven'es test; a reasonably authoritative web reference for the calculation is

Re: [R] Levene's test output

2013-06-21 Thread Rui Barradas
Hello, The Pr(F) is a regular p-value, with the usual meaning. Rui Barradas Em 21-06-2013 11:05, pieter escreveu: k. Thanks. Sorry i'm not the biggest statician, but I still find the output write out not the clearest of all. Anyway, that is probably a personal problem. :-) Just one question.

Re: [R] Levene's test output

2013-06-21 Thread Rui Barradas
Hello, Just to add to the last post, you can try to get that p-value using what that output gives you: df1 - 1 df2 - 356 F_stat - 10.948 pf(F_stat, df1, df2, lower.tail = FALSE) # same value Hope this helps, Rui Barradas Em 21-06-2013 12:11, Rui Barradas escreveu: Hello, The Pr(F) is a

Re: [R] Levene's test output

2013-06-21 Thread John Fox
Dear pieter, On Fri, 21 Jun 2013 10:12:26 +0200 pieter dencous...@gmail.com wrote: Hey, I don't really get the output of the performed Levene's test. So in short. two data sets, one with 75 elements, one with 283. And I want to check whether they have the same variance. I did a