Search found 430 matches

by GeorgeLeckie
Sun Feb 19, 2017 1:31 pm
Forum: runmlwin user forum
Topic: coefficients and variance partition differs considerably between runmlwin and melogit
Replies: 2
Views: 2676

Re: coefficients and variance partition differs considerably between runmlwin and melogit

Dear Lisa, The differences you see relate to the severe clustering exhibited in your data. MLwiN's default estimation method for binary and other categorical and count response models is quasilikelihood estimation and comes in four flavours of increasing accuracy, MQL1 (default), MQL2, PQL1 and PQL2...
by GeorgeLeckie
Tue Jan 24, 2017 10:07 am
Forum: runmlwin user forum
Topic: Use of predict and margins post-estimation
Replies: 1
Views: 2628

Re: Use of predict and margins post-estimation

Hi Marie,

I'm afraid you will have to make your graphs from first principles. We have not done anything in runmlwin to allow margins to work with it; it is a non-trivial task.

Best wishes

George
by GeorgeLeckie
Fri Jan 06, 2017 4:36 pm
Forum: MLwiN user forum
Topic: interpreting main effect in random slopes model
Replies: 1
Views: 1886

Re: interpreting main effect in random slopes model

Dear emazel90, I would keep the time trend in the fixed-part of the model even if the slope is not significant. The fixed-part time trend is such a fundamental part of the model, it would look odd to remove it, even though it is not significant. Essentially the population mean does not change over t...
by GeorgeLeckie
Thu Sep 15, 2016 10:51 am
Forum: runmlwin user forum
Topic: Multilevel piecewise logistic regression
Replies: 3
Views: 2730

Re: Multilevel piecewise logistic regression

Hi IgnacioA, I am not entirely sure what you are after. The question also seems more about working our what you want to do in terms of specifying your underlying statistical model rather than how to implement a given model in runmlwin. What might help is to first consider a standard piecewise linear...
by GeorgeLeckie
Fri Sep 02, 2016 10:53 am
Forum: runmlwin user forum
Topic: Testing variance components across equations
Replies: 2
Views: 2678

Re: Testing variance components across equations

Hi Phillipe, Wald tests are frowned upon when testing whether variance components are significant as variances do not have normal sampling distributions. For this reason, likelihood ratio tests are generally preferred in this setting. In your case you are interested in testing whether the difference...
by GeorgeLeckie
Fri Sep 02, 2016 10:49 am
Forum: MLwiN user forum
Topic: Calculating CI variables in multi level multiple regression models
Replies: 2
Views: 5103

Re: Calculating CI variables in multi level multiple regression models

Hi Helen,

In the latest version of MLwiN, the Model Comparison window now gives you p-values and 95% confidence intervals for each regression coefficient if you tick the relevant check boxes.

Best wishes

George
by GeorgeLeckie
Fri Sep 02, 2016 10:46 am
Forum: runmlwin user forum
Topic: Use of constraints with runmlwin
Replies: 4
Views: 3084

Re: Use of constraints with runmlwin

Hi Ron McDowell, I'm afraid there is no way to implements constraints in MLwiN when using MCMC estimation. The exception is in multivariate response models and ordered and unordered multinomial models where for each covariate you can impose common or separately estimated coefficients for each respon...
by GeorgeLeckie
Fri Sep 02, 2016 10:41 am
Forum: MLwiN user forum
Topic: Running 2-level MLM from variance-covariance matrices
Replies: 1
Views: 4155

Re: Running 2-level MLM from variance-covariance matrices

Hi Matt,

I'm afraid, in MLwiN and all other standard multilevel modelling data you need to fit models to the the underlying data, not to the summary statistics derived from these data.

Suggest you encourage the Government department to install MLwiN on their computers.

Best wishes

George
by GeorgeLeckie
Wed Aug 24, 2016 2:35 pm
Forum: R2MLwiN user forum
Topic: Relative risk ratios in R2MLwiN
Replies: 5
Views: 3888

Re: Relative risk ratios in R2MLwiN

Hi Timm, Just to clarify. Stata refers to the exponentiated regression coefficients from a multinomial logistic regression as "relative-risk ratios". This is the what the original post requested and Chris's proposed solution gives the user these ratios. http://www.stata.com/manuals14/rmlogit.pdf You...
by GeorgeLeckie
Tue Aug 16, 2016 4:14 pm
Forum: runmlwin user forum
Topic: p-value for the MCMC approach
Replies: 1
Views: 2221

Re: p-value for the MCMC approach

Hi Vivian,

While the one-sided p-values are displayed by default, if you instead specify the zratio option you will get "conventional" p-values based on assuming the parameters have normal sampling distributions. These p-values are associated with two-sided hypothesis testing.

Best wishes

George