Search found 9 matches

by MossyMcCollie
Tue Jul 09, 2019 3:48 pm
Forum: MLwiN user forum
Topic: Higher level predictors: are they worth it?
Replies: 1
Views: 864

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: 501

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: 501

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: 513

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: 513

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: 1575

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: 1575

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...
by MossyMcCollie
Tue Oct 16, 2018 5:33 pm
Forum: MLwiN user forum
Topic: Finite population correction
Replies: 3
Views: 1207

Re: Finite population correction

Thanks Bill. The papers I have read are a little inconsistent and/or vague on this matter, but on the whole seem to consider that correcting at both levels is appropriate. I'd be interested to hear from anyone who has faced the same issue or arrived at similar or different conclusions. Best wishes J...
by MossyMcCollie
Tue Oct 16, 2018 1:42 pm
Forum: MLwiN user forum
Topic: Finite population correction
Replies: 3
Views: 1207

Finite population correction

Hi all I am running a 2-level model with about 60 higher level units which have been randomly sampled from a population of about 150; thus about 40% of the entire population of higher level units is included in the sample. Each higher level unit (within and outwith the sample) is approximately the s...