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Results tagged with anova
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user 253
ANOVA stands for ANalysis Of VAriance, a statistical model and set of procedures for comparing multiple group means. The independent variables in an ANOVA model are categorical, but an ANOVA table can be used to test continuous variables as well.
4
votes
2
answers
314
views
Is there an ANOVA table generalization for two nested CART models?
The last line is an example of what I'm looking for:
data(airquality)
attach(airquality)
lm1 <- lm(Ozone ~ Solar.R+Wind)
lm2 <- lm(Ozone ~ Solar.R+Wind+Temp)
anova(lm1 , lm2)
require(rpart)
rp1 <- rpart … (Ozone ~ Solar.R+Wind)
rp2 <- rpart(Ozone ~ Solar.R+Wind+Temp)
anova(rp1 , rp2) # this doesn't exist - is there something like it? …
- 21.9k
24
votes
2
answers
75k
views
What is the NULL hypothesis for interaction in a two-way ANOVA?
The when performing a two way ANOVA of the type:
y~A+B+A*B
We are testing three null hypothesis:
There is no difference in the means
of factor A
There is no difference
in means of factor B
There …
- 21.9k
69
votes
9
answers
23k
views
How to visualize what ANOVA does?
is there to visually explain what is ANOVA?
Any references, link(s) (R packages?) will be welcomed. …
- 21.9k
6
votes
2
answers
3k
views
Is there an anova procedure that doesn't assume equal variance?
Is there something similar for (even one way) anova? (any R implementation of that?) …
- 21.9k
14
votes
5
answers
10k
views
Testing the normality assumption for repeated measures anova? (in R)
So assuming that there is a point in testing the normality assumption for anova (see 1 and 2)
How can it be tested in R? … N*P*K + Error(block), npk)
residuals(npk.aovE)
qqnorm(residuals(npk.aov))
Which doesn't work, since "residuals" don't have a method (nor predict, for that matter) for
the case of repeated measures anova …
- 21.9k
19
votes
3
answers
18k
views
A non-parametric repeated-measures multi-way Anova in R?
I wish to perform a non-parametric repeated measures multiway anova using R. … regression with {car} Anova function for multi way nonparametric anova, and so on. …
- 21.9k
12
votes
2
answers
5k
views
Testing the difference of (some) quantile-Q between groups?
For some Y variable, that is divided into 3 groups (X), I wish to compare the groups and for the hypothesis that the 90% quantile is the same between all three groups. What tests can I use?
One opti …
- 21.9k