Hi all
I have a question regarding the Fligner-Killeen test. I am using
- a PC with Windows XP (Build 20600.xpsp080413-2111 (Service Pack 3);
- the following R version:
> sessionInfo()
R version 2.7.0 (2008-04-22)
i386-pc-mingw32
I have a vector LENGTH and a factor RELATION that are distributed like this:
> table(LENGTH, RELATION)
RELATION
LENGTH object subject
1 9 51
2 25 18
3 36 23
4 23 14
5 17 13
6 12 7
7 10 5
8 3 7
9 4 3
10 3 5
11 4 2
12 2 0
13 0 2
16 2 1
22 0 1
49 1 0
53 1 0
I wanted to run a Fligner test to see whether the lengths for the two
relations differ in terms of their variance. This is what I found,
though:
#########
> fligner.test(LENGTH[RELATION=="subject"], LENGTH[RELATION=="object"])
Fligner-Killeen test of homogeneity of variances
data: LENGTH[RELATION == "subject"] and LENGTH[RELATION == "object"]
Fligner-Killeen:med chi-squared = 18.3552, df = 14, p-value = 0.1911
> fligner.test(LENGTH[RELATION=="object"], LENGTH[RELATION=="subject"])
Fligner-Killeen test of homogeneity of variances
data: LENGTH[RELATION == "object"] and LENGTH[RELATION == "subject"]
Fligner-Killeen:med chi-squared = 16.8838, df = 13, p-value = 0.2047
> fligner.test(LENGTH~RELATION)
Fligner-Killeen test of homogeneity of variances
data: LENGTH by RELATION
Fligner-Killeen:med chi-squared = 0.626, df = 1, p-value = 0.4288
#########
The order of the vectors etc. changes the results??? Needless to say
this does not happen with var.test or ... Is this normal; if so, which
one is the one to report?
Thanks,
STG
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