Issue: 1 out of 508 in use (lev 2 var) - LEMMA Mod 5

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szhou2715
Posts: 1
Joined: Tue Jun 22, 2021 5:05 pm

Issue: 1 out of 508 in use (lev 2 var) - LEMMA Mod 5

Post by szhou2715 »

Hello all,
Apologies if this is a simple issue. I am doing the LEMMA course on multilevel using MLwiN, and in Module 5 the very first practical is to estimate a null model with Level-2 schoolid. See attachment ("screenshot.jpg"). My MLwiN only shows using 1 out of 508 schoolid cases, and only 1 out of 33988 caseid cases. The actual equations screen should show 33988 of 33988, and 508 of 508 in use. What am I doing wrong?
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ChrisCharlton
Posts: 1285
Joined: Mon Oct 19, 2009 10:34 am

Re: Issue: 1 out of 508 in use (lev 2 var) - LEMMA Mod 5

Post by ChrisCharlton »

This sometimes happens when general notation is turned off and the cons variable, used to represent the intercept is added to the model before any other variables. As it doesn't yet know the length of the data being used in the model this is instead created with a length 1 and will subsequently result in only the first row of data being modelled. To fix this you can either recreate cons with the correct length via Data Manipulation>Generate Vector or set the response in the equation before turning off general notation.

This is unfortunately a bug in the software, which I will investigate fixing in later releases of the software.
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