search for: mcsim

...I am about to move all of my modelling work into R, and I have been investigating the present state of MCMC and Bayesian methods in R. Following a thread on the mailing list in 2000, I have looked at mcmcpack and Hydra. Three years down the line, is there anything new in this area? I have used both MCSim and WinBUGS in the past. The first one seems promising, but is too focused towards toxicology work, and needs some changes to accomodate sequential Bayesian models. WinBUGS is closed, and runs in windows only. Somebody has posted recently a message in the WinBUGS list asking for feedback on the pos...

Hi, I'm try to compute the minimum sample size needed to have at least an 80% of power, with alpha=0.05. The problem is that empirical proportions are really small: 0.00154 in one case and 0.00234. These are the estimated failure proportion of two medical treatments. Thomas and Conlon (1992) suggested Fisher's exact test and proposed a computational method, which according to their table

...epending on the data formats of response data and the prior specs using bayesglm in R. I'm not familiar with bayes estimate and my colleague asked me to look into this because the EPA from France reported a quite different estimates for the follwoing ethylene data applying bayes method using MCSIM. As seen below glm give same results regardless of response data format, i.e., two-column or binary formats, but bayesglm would give different results. The result from French report is -91.78+8*lnC+6.055*lnT which lie between prior.df=1 and 2 appling binary data format in R. My question are as fol...