Hi Joe
Is time a continuous variable or a factor?
The thing is that the terms ARE nested. The nesting is defined by the random
effects structure. The fixed effects slot into that. They way this happens is
defined by the coding in the data. So I assume you have something like
(simplified):
(apologies - I should have written coast * MBL not ML)
I'm not sure of my ground here, but surely do lose something - you wouldn't
retain coast:MBL if it's not significant, as you lose degrees of freedom, and
this gets worse the more terms and the more interactions you consider. I think
it's
The coast * ML term tests for HSP high/low dependent on coast. To test this
fit the full model with method = ML and compare it to lme(HSP~coast+MBL,
random= ~1|site, method =ML) using anova(model1, model2). There are alot of
technical issues with testing both fixed and random effects in
On Mon, Nov 10, 2008 at 9:22 AM, Mike Dunbar [EMAIL PROTECTED] wrote:
(apologies - I should have written coast * MBL not ML)
I'm not sure of my ground here, but surely do lose something - you wouldn't
retain coast:MBL if it's not significant, as you lose degrees of freedom, and
this gets
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hadley wickham wrote:
On Mon, Nov 10, 2008 at 9:22 AM, Mike Dunbar [EMAIL PROTECTED] wrote:
(apologies - I should have written coast * MBL not ML)
I'm not sure of my ground here, but surely do lose something -
you wouldn't retain coast:MBL if
On Mon, Nov 10, 2008 at 2:02 PM, Ben Bolker [EMAIL PROTECTED] wrote:
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hadley wickham wrote:
On Mon, Nov 10, 2008 at 9:22 AM, Mike Dunbar [EMAIL PROTECTED] wrote:
(apologies - I should have written coast * MBL not ML)
I'm not sure of my ground
Hey Everyone,
I'm helping a friend out with analyzing some of her data, and I
haven't run an ANOVA like this in a while, and especially not in R. I'm
having a bit of trouble figuring out the correct syntax and so I was
hoping to get feedback. Any input would be welcomed. As of now, I
Hi Joe
I think the command you want is probably simpler than you think:
lme(HSP~coast*MBL, random= ~1|site)
or
lme(HSP~coast+MBL, random= ~1|site)
coast and MBL have distinct levels so are fixed and site is random as you say.
Having site as random will take into account that there
Hi Mike,
Thanks for the response, hopefully we can get this thing figured
out. And I hope things will be easier than I think--that's usually a
good thing! However, I do wonder if I didn't explain myself fully (too
often the case). My apologies for not clearly stating the hypotheses.
