Displaying 7 results from an estimated 7 matches similar to: "lmer and estimation of p-values: error with mcmcpvalue()"
2007 Feb 13
1
lme4/lmer: P-Values from mcmc samples or chi2-tests?
Dear R users,
I have now tried out several options of obtaining p-values for
(quasi)poisson lmer models, including Markov-chain Monte Carlo sampling
and single-term deletions with subsequent chi-square tests (although I
am aware that the latter may be problematic).
However, I encountered several problems that can be classified as
(1) the quasipoisson lmer model does not give p-values when
2007 Mar 12
0
Pvalues and lme
Dear R users,
I have developed a model
I have compared several options of obtaining p-values for
poisson lmer model including Marlov chain monty carlo methods, single
term deletions and summary.
>
> However, I encountered several problems that can be classified as
> (1) the p values from the summary command are total different from
those derived from Marlov chain monty carlo methods
>
2009 Feb 24
2
lmer, estimation of p-values and mcmcsamp
(To the list moderator: I just subscribed to the list. Apologies for not
having done so longer before trying to post.)
Hi all,
I am currently using lmer to analyze data from an experiment with a
single fixed factor (treatment, 6 levels) and a single random factor
(block). I've been trying to follow the online guidance for estimating
p-values for parameter estimates on these and other
2007 Mar 12
2
Lmer Mcmc Summary and p values
Dear R users
I am trying to obtain p-values for (quasi)poisson lmer models, including
Markov-chain Monte Carlo sampling and the command summary.
>
> My problems is that p values derived from both these methods are
totally different. My question is
(1) there a bug in my code and
>
(2) How can I proceed, left with these uncertainties in the estimations of
> the p-values?
>
> Below
2007 Mar 13
1
lme4 and mcmcamp
Dear R users
I am trying to obtain p-values for (quasi)poisson lmer models, using
Markov-chain Monte Carlo sampling and the command summary.
>
> My problems is that p values derived from both these methods are
totally different. My question is
(1) there a bug in my code and
>
(2) How can I proceed, left with these uncertainties in the estimations of
> the p-values?
>
> Below is
2008 Aug 29
1
significance of random effects in poisson lmer
Hi,
I am having problems trying to assess the significance of random terms
in a generalized linear mixed model using lme4 package. The model
describes bird species richness R along roads (offset by log length of
road log_length) as a function of fixed effects Shrub (%shrub cover) and
Width (width of road), and random effect Site (nested within Site
Cluster).
>From reading answers to previous
2008 Sep 16
1
Spatial join – optimizing code
Hi,
Few days ago I have asked about spatial join on the minimum distance between 2 sets of points with coordinates and attributes in 2 different data frames.
Simon Knapp sent code to do it when calculating distance on a sphere using lat, long coordinates and I've change his code to use Euclidian distances since my data had UTM coordinates.
Typically one data frame has around 30 000 points