Search found 14 matches

by erikruzek
Wed Jul 14, 2021 4:47 pm
Forum: runmlwin user forum
Topic: Keep data in MLwiN after model estimation to speed up subsequent modeling?
Replies: 2
Views: 608

Re: Keep data in MLwiN after model estimation to speed up subsequent modeling?

Thanks for the quick response, Chris! I figured it was a longshot, but your proposed workaround is a good option.
by erikruzek
Tue Jul 13, 2021 9:41 pm
Forum: runmlwin user forum
Topic: Keep data in MLwiN after model estimation to speed up subsequent modeling?
Replies: 2
Views: 608

Keep data in MLwiN after model estimation to speed up subsequent modeling?

Hi all, I have been working with large data files (1+ GB) and it would be helpful for me to be able to keep the data in MLwiN to prevent the Stata to MLwiN data transfer that happens each time I fire off a model using runmlwin. Is it possible to avoid the data transfer step and keep my data in MLwiN...
by erikruzek
Tue Feb 02, 2021 8:04 pm
Forum: runmlwin user forum
Topic: Is it possible to constrain the residual variance in MLwiN?
Replies: 5
Views: 8163

Re: Is it possible to constrain the residual variance in MLwiN?

Thanks, Chris and George. George, I am having trouble locating a web example from HLM. My colleague said that that it involves the fixsigma2 command (setting it to 1) and then specifying a "varianceknown" variable. Below is a snippet of code from a HLM syntax file. It looks like something ...
by erikruzek
Tue Feb 02, 2021 12:01 am
Forum: runmlwin user forum
Topic: Is it possible to constrain the residual variance in MLwiN?
Replies: 5
Views: 8163

Re: Is it possible to constrain the residual variance in MLwiN?

Hi George, Thanks so much. In the example you linked, the residual variance was set at a single value (scalar). constraint define 1 [RP1]var(cons) = 0.5 I would like to set the residual variance to a variable in the dataset given that the SEM is unique to each observation in the data. constraint def...
by erikruzek
Mon Feb 01, 2021 10:45 pm
Forum: runmlwin user forum
Topic: Is it possible to constrain the residual variance in MLwiN?
Replies: 5
Views: 8163

Is it possible to constrain the residual variance in MLwiN?

Hi all, I am running a longitudinal model on an outcome that was measured and scored using a 1-PL IRT model (Rasch). For each observation of the outcome, there is an associated standard error of measurement (SEM). Is it possible to fix or constrain the residual variance in a MLwiN model (via runmlwi...
by erikruzek
Thu Dec 03, 2020 2:58 pm
Forum: runmlwin user forum
Topic: Order of Predicted Residuals with Multiple Random Slopes
Replies: 2
Views: 7021

Re: Order of Predicted Residuals with Multiple Random Slopes

Thanks, Chris. That makes sense. I can see why I was confused - I did not mean to exclude the intercept from the fixed part of the model! Had I included it there, then uc0 would have been the random intercept.
by erikruzek
Wed Dec 02, 2020 8:30 pm
Forum: runmlwin user forum
Topic: Order of Predicted Residuals with Multiple Random Slopes
Replies: 2
Views: 7021

Order of Predicted Residuals with Multiple Random Slopes

Hi Chris, George, and everyone, When running a model with multiple random slopes and getting the Empirical Bayes predictions, is there a way to tell how the newly produced residual variables map onto the intercept and slopes? I am running the following model: runmlwin RIT time time2, level3(first_sc...
by erikruzek
Fri Apr 03, 2020 12:33 am
Forum: runmlwin user forum
Topic: Setting up an AR(1) model
Replies: 3
Views: 2698

Re: Setting up an AR(1) model

Got it, Chris. Is it possible to setup a similar model as the Rats example in Chapter 19 with two outcomes like I have here?
by erikruzek
Mon Mar 30, 2020 7:24 pm
Forum: runmlwin user forum
Topic: Setting up an AR(1) model
Replies: 3
Views: 2698

Setting up an AR(1) model

Hi Chris, George, and all, I hope everyone is doing well. I have a question about setting up and running a growth curve model that has the additional wrinkle of allowing for an AR(1) structure to the residuals. I have looked at the MCMC manual, chapter 19, and seen the example with the rats dataset....
by erikruzek
Fri Sep 27, 2019 4:12 pm
Forum: runmlwin user forum
Topic: Number of groups varies between 2- and 3-level multivariate MLM
Replies: 4
Views: 8486

Re: Number of groups varies between 2- and 3-level multivariate MLM

Thanks, Chris. Knowing the CC exists and it is so easily handled in MLwiN, I agree it makes sense to model it correctly. I did so and variance and covariance estimates at each of the levels are quite similar, and as a result, the number of groups being reported is exactly aligned with expectations.