...@gmail.com
To: tedtoal twt...@ucdavis.edu
Cc: r-help@r-project.org
Sent: Wednesday, July 25, 2012 6:21 AM
Subject: Re: [R] Between-group variance from ANOVA
There is nothing about R in your question, hence it is not appropriate
for this list. Please consult with a local statistician, or post on a
stats
, July 25, 2012 6:21 AM
Subject: Re: [R] Between-group variance from ANOVA
There is nothing about R in your question, hence it is not appropriate
for this list. Please consult with a local statistician, or post on a
stats help list such as http://stats.stackexchange.com/
On Tue, Jul 24, 2012
There is nothing about R in your question, hence it is not appropriate
for this list. Please consult with a local statistician, or post on a
stats help list such as http://stats.stackexchange.com/
On Tue, Jul 24, 2012 at 8:55 PM, tedtoal twt...@ucdavis.edu wrote:
I'm trying also to understand
I'm trying also to understand how to get the between-group variance
out of a one-way ANOVA, but I'm beginning to think that in a sense,
the variance does not exist. Emma said:
*The model is response(i,j)= group(i)+ error(i,j)*
Yes, if by group(i) you mean intercept +
I'm trying also to understand how to get the between-group variance out of a
one-way ANOVA, but I'm beginning to think that in a sense, the variance does
not exist. Emma said:
*The model is response(i,j)= group(i)+ error(i,j)*
Yes, if by group(i) you mean intercept + coefficient[i].
*we assume
Hi Emma,
...from this I can read the within-group variance. can anyone tell me how
i may find
out the between-group variance?
But it's in the table, above the within-group variance. Remember that F is
the ratio of these two quantities, i.e. the mean of the group variances
divided by the
Hi Emma,
...
I forgot to add the tabular ouput, which doesn't help either:
T.sum - summary(aov(response ~ group, data=TDat))
print(T.sum)
Df Sum Sq Mean Sq F valuePr(F)
group 1 11225.2 11225.23084 2.2e-16 ***
Residuals 198 720.7 3.6
can anyone advise me please?
emj83 wrote:
I have done some ANOVA tables for some data that I have, from this I can
read the within-group variance. can anyone tell me how i may find out the
between-group variance?
Thanks Emma
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I have done this in R and this is the following ANOVA table I get:
summary(aov(response ~ group, data=TDat))
Df Sum Sq Mean Sq F valuePr(F)
group 1 11203.5 11203.5 2505.0 2.2e-16 ***
Residuals 198 885.5 4.5
The model is response(i,j)= group(i)+ error(i,j),
Hi Emma,
R gives you the tools to work this out.
## Example
set.seed(7)
TDat - data.frame(response = c(rnorm(100, 5, 2), rnorm(100, 20, 2)))
TDat$group - gl(2, 100, labels=c(A,B))
with(TDat, boxplot(split(response, group)))
summary(aov(response ~ group, data=TDat))
Regards, Mark.
emj83
I have done some ANOVA tables for some data that I have, from this I can read
the within-group variance. can anyone tell me how i may find out the
between-group variance?
Thanks Emma
--
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