Search found 140 matches

by billb
Thu Dec 03, 2020 1:46 pm
Forum: runmlwin user forum
Topic: Variance Decomposition
Replies: 3
Views: 1897

Re: Variance Decomposition

Hi Lmcrace, Yes it sounds like you may have cross classifications and multiple memberships. My only question would be whether these different 'effects' are all identifiable and how big your data is. For example I can think in education of a dataset with kids nested within classes and teachers but if...
by billb
Mon Nov 23, 2020 5:21 pm
Forum: MLwiN user forum
Topic: About multivariate response model
Replies: 1
Views: 1448

Re: About multivariate response model

Dear Tomay, I would suggest that you take a look through the manual about multilevel multivariate responses. 1. When you add predictor variables you can as you correctly point out add them as common coefficient which (at least for IGLS) will give you the same effect for A and B. 2. Yes just make sur...
by billb
Thu Oct 08, 2020 7:30 pm
Forum: MLwiN user forum
Topic: Detecting significant results
Replies: 6
Views: 2286

Re: Detecting significant results

Hi Sabine,
I am afraid outside of MCMC you are stuck with the approximate Wald test (which essentially assumes normality) of equivalently the P values spat out by the Store model window which does likewise.
Best wishes,
Bill.
by billb
Thu Oct 08, 2020 1:36 pm
Forum: MLwiN user forum
Topic: Detecting significant results
Replies: 6
Views: 2286

Re: Detecting significant results

Hi Sabine, Not sure I follow your question - the interval and tests window will give you a P value if we are still talking about the same model but you need to tell it what Wald test to perform (there is something about this window in the help system and an example in the binary response chapter of ...
by billb
Thu Oct 08, 2020 12:55 pm
Forum: MLwiN user forum
Topic: Detecting significant results
Replies: 6
Views: 2286

Re: Detecting significant results

Hi Sabine, The estimates from MQL / PQL are quasi-likelihood so you cannot do a standard likelihood-based test to get a P value. You can do an approximate Wald test via the intervals and tests window but bear in mind this assumes normality for the variables so is only an approximation. Hope that hel...
by billb
Tue Jul 28, 2020 12:24 pm
Forum: MLwiN user forum
Topic: Constraining multilevel logistic regression model
Replies: 5
Views: 2846

Re: Constraining multilevel logistic regression model

If you leave it unconstrained then it is simply pointing to the maximum (quasi)likelihood solution being 0 for the variance i.e. there is probably no influence of the hierarchical structure. You could try fitting the model using MCMC to see what estimates that gives,
Bill.
by billb
Tue Jul 28, 2020 12:04 pm
Forum: MLwiN user forum
Topic: Constraining multilevel logistic regression model
Replies: 5
Views: 2846

Re: Constraining multilevel logistic regression model

Dear KW844529, What you are doing doesn't make sense at all as in the logistic regression model, value normally used for the level 1 variance stored in that column is in fact the scaling factor for over/underdispersion and set at 1 for a standard logistic regression with binomial variation. It there...
by billb
Tue Jun 30, 2020 11:19 am
Forum: MLwiN user forum
Topic: Power/Effective Sample Size
Replies: 5
Views: 5670

Re: Power/Effective Sample Size

The effective sample size and Raftery Lewis are completely different diagnostics and in fact a low Raftery Lewis number is good as the diagnostic is a minimum number to run for. In contrast a high ESS is good as it gives an estimate of the equivalent number of independent estimates for the parameter...
by billb
Fri May 15, 2020 8:37 am
Forum: R2MLwiN user forum
Topic: Complex surveys with MI and replicate weights
Replies: 1
Views: 2636

Re: Complex surveys with MI and replicate weights

Dear GKonyarov, Thanks for the post. I have read it a couple of times and although you describe your models I wasn't sure what exactly question you are asking here? Apologies that in lockdown I have been a bit slow to look at the forums and sadly we have lost our colleague Harvey Goldstein whose pap...
by billb
Fri May 15, 2020 8:32 am
Forum: MLwiN user forum
Topic: How to estimate a multi-level multi-process event history model (binary and categorical responses)
Replies: 2
Views: 2208

Re: How to estimate a multi-level multi-process event history model (binary and categorical responses)

Hi Ashley, Thanks for your question. I am a bit rusty on these sorts of models and taking a quick look at the equations window in MLwiN when you try and fit multivariate response models you are restricted to responses being normal, binomial or Poisson. I don't know if this has changed since the slid...