On Aug 13, 2012, at 8:03 AM, Pearson, Aislinn wrote:
Hi,
I am analysing some data using ANOVA and I want to check that all of
my assumptions are correct (constant variance, normal distribution
of errors, etc). I understand from Mick Crawley's 'Statistics: An
introduction using R" that the best way to do this is to use
plot(model):
model<-aov(Total.Distance_Log~Treatment)
summary(model)
quartz()
plot(model)
Sometimes you need to create an output window so that plot.new() will
succeed.
There are no problems writing the model or summarising it. However,
when I try to plot it using the above code the image window for the
graph is empty. The console gives the instruction to hit return to
see the next graph, but this doesn't seem to generate anything
either. I know that the image window works because I was using it to
create histograms as an alternative way of checking that the data is
normally distributed:
hist(Total.Distance_Log)
I also think plot(model) works as I asked a colleague to check it on
his PC.
I have had a look on the wiki, but haven't found anything yet. If
anyone knows what I am doing wrong I would be grateful for some
advice.
Thank you
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David Winsemius, MD
Alameda, CA, USA
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