how to derive 5 level nested anova results table
On Wed, Feb 11, 2009 at 2:36 AM, Mao Jianfeng <jianfeng.mao at gmail.com> wrote:
Hello.
I am new to R. And, I want to perform a multiple nested anova on a large datasets (with 9448 observations). Under the helps from R-Sig-ecology mailing list, I have gained many progresses. But I still have some confusions. I want to ask for some helps here.
my dataset("SeedL.txt") was not attached. Data are not sorted by factors.
In this dataset, "SpecN" "PopN" "TreeN" "ConeN" "SeedN" were 5 factors (as Explanatory), with "PopN" nested within "SpecN"; "TreeN" nested within "PopN"; "ConeN" nested within "TreeN" and "SeedN" nested within "ConeN". These are categories.
"SeedL" is a dependent variate (as Response).
Thank you for your inquiry. Your data sound fascinating. I have, on occasion, described several levels of nested categories with a hypothetical example having a structure like this (my hypothetical example used "seed pod" instead of cone). It is charming to see a hypothetical example suddenly spring to life.
I have performed a successful mutinested anova using function lme() (library(nlme)).But I still do not know how to get a anova result table (sth. like SAS output).
Could you provide more detail on what you would like to see in such an anova table, please? For example, are you interested in the results of hypothesis tests regarding whether certain variance components can be zero? You may find that intervals(f1) provides some of the information you want to see (although not the type of hypothesis test I mentioned above).
f1 <- lme(SeedL~1, data=seedL, random=~1|SpecN/PopN/TreeN,
na.action=na.omit)
f1
Linear mixed-effects model fit by REML
Data: seedL
Log-restricted-likelihood: 14369.45
Fixed: SeedL ~ 1
(Intercept)
0.6153105
Random effects:
Formula: ~1 | SpecN
(Intercept)
StdDev: 0.08008076
Formula: ~1 | PopN %in% SpecN
(Intercept)
StdDev: 0.05413198
Formula: ~1 | TreeN %in% PopN %in% SpecN
(Intercept) Residual
StdDev: 0.04566776 0.04790476
Number of Observations: 9447
Number of Groups:
SpecN PopN %in% SpecN TreeN %in% PopN %in%
SpecN
3 47
731
anova(f1)
numDF denDF F-value p-value
(Intercept) 1 8716 169.2052 <.0001
I appreciate any advice.
Mao J-F
State Key Lab of Systematics and Evolutionary Botany
Institute of Botany
Chinese Academy of Sciences
Beijing, China
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