[R-sig-eco] joint distribution

2014-01-17 Thread ??
Dear All I get samples from MCMC sampling to a posterior distribution. there is four variables, how could I get a joint distribution for this four variable from the samples? Thanks in advance~! Han Ming [[alternative HTML version deleted]]

Re: [R-sig-eco] joint distribution

2014-01-17 Thread Baldwin, Jim -FS
An explicit formula for a posterior distribution is not something to expect from an MCMC procedure. But the next best thing to an explicit formula for a posterior distribution is a zillion samples from that distribution (which is what you have). What you can do is display smooth

[R-sig-eco] Bayesian analysis with MCMC

2014-01-17 Thread ??
Dear all I have a model with four paramters, I want to estimate the parameter uncertainty, so Bayesian analysis with MCMC method is applied. But every sigle mcmc chain seems give quite different parameter marginal distributions. In order to get the true parameter marginal

[R-sig-eco] Identification of outliers using NMDS goodness of fit statistic

2014-01-17 Thread scoyoc
R-sig-ecology peeps, I have been helping a friend run an NMDS and we started talking about the the goodness of fit statistic (GOF) to identify outliers. It got me thinking about this metric a bit more. I have always used exploratory analysis procedures, like normal qqplot, histograms, box plots,