[R] lme and confidence intervals
gregory.warnes at mac.com
Thu Apr 10 16:09:33 CEST 2008
FWIW, the ci() function in the gmodels package supports generating
confidence intervals for the fixed effects of lme objects.
On Apr 8, 2008, at 1:34PM , Dieter Menne wrote:
> Cristian Carranza <cristiancarranza_1 <at> hotmail.com> writes:
>> After fitting a mixed effects model to repeated measurements data
>> set, and
> after several unsuccessful
>> atempts to make a simple plot of the confidence interval for the
>> fitted model,
> I gave up and now I am asking
>> for help in this useful list.
>> Could anyone be so kind to give me some code lines in order to
>> make a plot of
> the fitted equation and the
>> correspondent confidence interval?
> The fitted equation is simple: use predict in its variations. For the
> "confidence interval", most people on the list will ask back what
> it means. But
> I know my colleagues, they or their reviewers insist on having
> error bar in the
> graphics, and don't care about the interpretation.
> Dimitri has given an approach that could be used to produce some
> reviewer-satisfaction plots limited borborygmy.
> Note that his method is meant to estimate well-defined confidence
> intervals for
> the coefficients, but you can use the profiled fits and compute the
> intervals" at the data points. Alternatively, you could use mcmc to
> get a range
> of curves for averaging.
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