Hello everyone:
I'm a new member of this group.
Following the question(2) of Amit Patel-7,
I know "oneway.test" has the option of
"var.equal=F".
Maybe it's can be the answer of this quest
On 2010-12-15 11:12, brianiphk wrote:
I'm trying to run an ANOVA in R and I have a problem:
I used this command: anova(lm(time~age*region*facility))
Age, region, and facility are all factor levels, which has 2, 4, and 3
levels respectively.
however, in the output (anova table), it states that
From: Tal Galili
To: Stephen Liu
Cc: r-help@r-project.org
Sent: Thu, August 19, 2010 11:05:38 AM
Subject: Re: [R] Help with ANOVA
>#first:
>install.packages("reshape")
>#Then try:
>library(reshape)
>#and then
>?melt
>?cast
Hi Tal,
I got it done as a
On 08/18/2010 10:05 PM, Tal Galili wrote:
Hi Stephen,
#first:
install.packages("reshape")
#Then try:
library(reshape)
#and then
?melt
?cast
This is also useful:
http://www.jstatsoft.org/v21/i12/paper
__
R-help@r-project.org mailing list
https://sta
Cc: r-help@r-project.org
> Sent: Thu, August 19, 2010 10:23:04 AM
> Subject: Re: [R] Help with ANOVA
>
> - snip -
>
> >Also, you might need to move your data from wide to long. For which you
> >might wish to look at
> >?reshape
> >(or better yet the
>
- Original Message
From: Tal Galili
To: Sneeketeeke
Cc: r-help@r-project.org
Sent: Thu, August 19, 2010 10:23:04 AM
Subject: Re: [R] Help with ANOVA
- snip -
>Also, you might need to move your data from wide to long. For which you
>might wish to look at
>?reshape
>(or be
Hi Sneeketeeke,
Did you happen to have a look at the example on
?aov
and
?TukeyHSD
Also, you might need to move your data from wide to long. For which you
might wish to look at
?reshape
(or better yet the
?melt
?cast
commands from the reshape package)
Tal
Contact
Details:---
Hi:
I'd suggest looking at the following plot (data in original post, copied
below):
library(lattice)
stripplot(Intensity ~ Group, data = zzzanova)
Some things stand out in this plot that merit attention.
As Josh Wiley pointed out in an earlier reply, the concentration of -4.60517
values
in thi
treated in the analysis (i.e ignored or -4.60517). Im not
> sure what your ANOVA background is but I just wanted to check that I'm using
> ANOVA correctly. Im using the assumption that the Pr(>F)1 value is the actual
> p-value.
>
> Thanks again for your help
>
>
&g
7", "18", "19", "20",
> "21", "22", "23", "24", "25", "26", "27", "28", "29", "30",
> "31", "32", "33", "34", "35&q
We're missing the samp1 etc. in order to be able to test the code.
Where did you get the other p-value?
Cheers
Joris
On Tue, Jul 6, 2010 at 3:08 PM, Amit Patel wrote:
> Hi I needed some help with ANOVA
>
> I have a problem with My ANOVA
> analysis. I have a dataset with a known ANOVA p-value, how
Hi Amit,
When I copy in your data and run
aov(Intensity ~ Group, data = zzzanova)
I get neither the p-value you showed nor the one you expected. My
suggestions at things to look at would be
1) Where/How did you get the expected p-value? Another statistics
program (e.g., SPSS or SAS)? It help
>
> Your line of code:
>
> zzz.aov <- aov(Intensity ~ Group + Error(Sample), data = zzzanova)
>
> indicates that you are trying to do a repeated measures ANOVA, not just an
> ANOVA. The Error(Sample) term in your expression indicates that Sample is a
> within subjects factor, which I presume is
Your line of code:
zzz.aov <- aov(Intensity ~ Group + Error(Sample), data = zzzanova)
indicates that you are trying to do a repeated measures ANOVA, not just an
ANOVA. The Error(Sample) term in your expression indicates that Sample is a
within subjects factor, which I presume is not the case.
Hi, you can try something like:
summary( zzz.aov )[[1]][ "Pr(>F)" ]
Regards
2009/4/14 Amit Patel
>
> Hi
> I have done ANOVA on a dataset (See Below) but am having problems
> retreiving the p-value. I am assuming that Pr(>F) is the p-value but cannot
> get this value or in fact any other value
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