Search found 156 matches

by billb
Mon Aug 15, 2011 1:20 pm
Forum: MLwiN user forum
Topic: Error 1909 using MCMC on Multivariate data
Replies: 1
Views: 5014

Re: Error 1909 using MCMC on Multivariate data

Hi Thomasm, If you wish to create imputed datasets to fill in what will ultimately be X variables in your model to fit you need to have them as response variables in the imputation model you first fit. Say for example with the hungary dataset your final model is going to be a regression of biol_core...
by billb
Mon Aug 15, 2011 1:11 pm
Forum: MLwiN user forum
Topic: CIs for slope residuals
Replies: 1
Views: 4298

Re: CIs for slope residuals

Hi Dave, I took a look at your data and discovered that the IGLS algorithm is estimating a non-positive definite variance matrix at level 2. Apologies for the technical jargon but basically if you were to look at your estimates for the between TherID variance matrix in the Estimate Tables window and...
by billb
Tue Aug 03, 2010 3:02 pm
Forum: MLwiN user forum
Topic: Residuals in MCMC
Replies: 1
Views: 4424

Re: Residuals in MCMC

Hi Michael,
Rather impressively you are the first person to spot this mistake - yes the elements given give 90% not 95% confidence intervals. If/When I get around to updating the manual next I'll try and amend this.
Thanks,
Bill.
by billb
Fri May 21, 2010 1:54 pm
Forum: MLwiN user forum
Topic: MCMC Error in CAR modelling
Replies: 1
Views: 4854

Re: MCMC Error in CAR modelling

Hi Karen,
I could take a look if you were happy to send on the worksheet. Note i and j might refer to the areas in the order the software receives them and not the labels they have.
Bill.
by billb
Fri May 21, 2010 1:51 pm
Forum: MLwiN user forum
Topic: Bizarre error message
Replies: 2
Views: 6172

Re: Bizarre error message

Hi NtD71, I suspect what happened is you had a column called 'P' in the data you imported and the macros for multinomial models name certain columns with single letter names including 'P'. Thus when the macro tries to name something as 'P' MLwiN complains that 'P' already exists. The only solution i...
by billb
Fri May 21, 2010 1:34 pm
Forum: MLwiN user forum
Topic: Factor loadings in MCMC
Replies: 1
Views: 4700

Re: Factor loadings in MCMC

Hi Katy, With MCMC estimation you need to constrain some parameters to make the factor analysis identifiable as the method is simulation-based. The constraining of a loading to 1 is one possible scenario - you will then get loadings of other variables relative to this loading so you will have some m...