How to compute ICC when L2 variance is negative?

Welcome to the forum for MLwiN users. Feel free to post your question about MLwiN software here. The Centre for Multilevel Modelling take no responsibility for the accuracy of these posts, we are unable to monitor them closely. Do go ahead and post your question and thank you in advance if you find the time to post any answers!

Remember to check out our extensive software FAQs which may answer your question: http://www.bristol.ac.uk/cmm/software/s ... port-faqs/
Forum rules
Post Reply
erima
Posts: 1
Joined: Mon Sep 27, 2010 2:06 pm

How to compute ICC when L2 variance is negative?

Post by erima »

Hello,
I am fitting a fixed factor model and the variance at level 2 is negative. Would any of you know what this means, and how I compute an ICC ? Shall I use the absolute value when computing it ? If so, this would underestimate the total variance : varL2negvalue / varL2neg_value + VarL1
Thank you in advance for your help !

With best wishes,
Eric
Top
Camster
Posts: 3
Joined: Mon Oct 04, 2010 4:05 pm

Re: How to compute ICC when L2 variance is negative?

Post by Camster »

Hi Eric,

Could you post details of your model?
You should not get a negative variance, so that means something has gone wrong somewhere.
Have you checked if your data are correctly sorted.

Best,

Camster
Top
Post Reply

Return to “MLwiN user forum”