Re: [R] leveneTest - output

[Rui Barradas]

Hello,

Just to add that the value 0.9829 [Pr(>F)] can be checked with

pf(0.0173, df1 = 2, df2 = 7, lower.tail = FALSE)

Rui Barradas

Em 01-10-2013 19:02, John Fox escreveu:

Dear Hermann,

-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-bounces@r-
project.org] On Behalf Of Hermann Norpois
Sent: Tuesday, October 01, 2013 8:07 AM
To: r-help
Subject: [R] leveneTest - output

Hello,

I have a question concerning the output of leveneTest. I don't
understand
the "7" in my output

That's the denominator df for F.

Best,
  John

Levene's Test for Homogeneity of Variance (center = median)
       Df F value Pr(>F)
group  2  0.0173 0.9829
        7        # Where does this number come from?

Thanks.
Hermann

res

    group.ID    qtrait
1         0 6462.3288
2         0  816.7808
3         0 6031.3356
4         0 1013.5274
5         0 1517.2500
6         1 1585.2740
7         1 2481.6781
8         1 8871.5753
9         2 4913.5274
10        2  833.7329

ltest <- leveneTest (qtrait~group.ID, res)
ltest

Levene's Test for Homogeneity of Variance (center = median)
       Df F value Pr(>F)
group  2  0.0173 0.9829
        7

dput (res)

structure(list(group.ID = structure(c(1L, 1L, 1L, 1L, 1L, 2L,
2L, 2L, 3L, 3L), .Label = c("0", "1", "2"), class = "factor"),
     qtrait = c(6462.32876712329, 816.780821917808, 6031.33561643836,
     1013.52739726027, 1517.25, 1585.27397260274, 2481.67808219178,
     8871.57534246575, 4913.52739726027, 833.732876712329)), .Names =
c("group.ID",
"qtrait"), row.names = c(NA, -10L), class = "data.frame")

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