Search found 12 matches

by MossyMcCollie
Wed Mar 17, 2021 7:24 pm
Forum: MLwiN user forum
Topic: Nested models with fixed - sort of - categories
Replies: 2
Views: 1307

Re: Nested models with fixed - sort of - categories

That does indeed help Bill - it's exactly what I needed to know. Many thanks.
by MossyMcCollie
Tue Mar 16, 2021 8:03 pm
Forum: MLwiN user forum
Topic: Nested models with fixed - sort of - categories
Replies: 2
Views: 1307

Nested models with fixed - sort of - categories

I have been asked to run a model in which individuals are nested within divisions of an organisation, and divisions are nested within departments. I am not sure how to treat the upper levels of the hierarchy. I currently have received data from about 96% of the divisions (about 250 in total), which ...
by MossyMcCollie
Thu Jul 18, 2019 6:07 pm
Forum: MLwiN user forum
Topic: Higher level predictors: are they worth it?
Replies: 2
Views: 3387

Re: Higher level predictors: are they worth it?

Thanks Bill - I did not think of the implications of using Level 2 predictors to potentially reduce the number of model levels.
by MossyMcCollie
Tue Jul 09, 2019 3:48 pm
Forum: MLwiN user forum
Topic: Higher level predictors: are they worth it?
Replies: 2
Views: 3387

Higher level predictors: are they worth it?

I am running a 2-level model with several hundred thousand level-1 units but only about 70 level-2 units. I have already identified a set of level-1 predictors for inclusion, and am considering which, if any, predictors to add in at level-2. I can identify about 9 individual L-2 predictors whose ind...
by MossyMcCollie
Fri Mar 01, 2019 4:02 pm
Forum: MLwiN user forum
Topic: Sequential modelling strategies in ML modelling
Replies: 2
Views: 2557

Re: Sequential modelling strategies in ML modelling

Thanks Bill - good to know that the structure may not be the constraint I thought it might be. I take your point about the random slopes - I will have to give that some careful consideration.
John
by MossyMcCollie
Fri Mar 01, 2019 12:42 pm
Forum: MLwiN user forum
Topic: Sequential modelling strategies in ML modelling
Replies: 2
Views: 2557

Sequential modelling strategies in ML modelling

Hi all I have a large number of variables for potential inclusion in a 2-level model. If this were a single level model I would apply a sequential modelling strategy: identify a number of blocks of variables and enter each block in order of block priority. I'm not sure if or how the existence of the...
by MossyMcCollie
Mon Feb 11, 2019 3:47 pm
Forum: MLwiN user forum
Topic: Trying to import data with first row treated as column headings
Replies: 2
Views: 2631

Re: Trying to import data with first row treated as column headings

Thanks Chris - I'm glad I was not missing something obvious anyway!
by MossyMcCollie
Mon Feb 11, 2019 2:32 pm
Forum: MLwiN user forum
Topic: Trying to import data with first row treated as column headings
Replies: 2
Views: 2631

Trying to import data with first row treated as column headings

I am trying to import a large text file into MLwiN, but using both the Import and the ASCII Text File Input options, the data is imported with the column headings as the first row. My data files are very large in terms of number of variables (100 or so), and cases (3 million); and although Pasting d...
by MossyMcCollie
Sun Nov 11, 2018 1:21 pm
Forum: MLwiN user forum
Topic: Related variables at different levels
Replies: 2
Views: 3517

Re: Related variables at different levels

Yes, that is very helpful, Bill thank you very much. Apologies for the slow acknowledgement of your response: I have been offsite for a while.
by MossyMcCollie
Wed Oct 31, 2018 10:26 am
Forum: MLwiN user forum
Topic: Related variables at different levels
Replies: 2
Views: 3517

Related variables at different levels

Hi all I have a 2-level model in which individuals (lower level 1) and nested within communities (higher level 2). The outcome measure is binary: whether or not an individual needs to access a particular social service. One of the level-1 variables I need to include is ethnicity. It is considered ve...