c-hat and robust design

[Lyndon]

I've fitted a closed RD model (28 primary samples, 132 samples). I'm not aware of how overdispersion may be assessed for this model. Can anybody recommend an approach? One possibility that may be reasonable may be to use a c-hat from a CJS model based on data collapsed to primary samples. Does anyone have a view on that?

[cooch]

I've fitted a closed RD model (28 primary samples, 132 samples). I'm not aware of how overdispersion may be assessed for this model. Can anybody recommend an approach? One possibility that may be reasonable may be to use a c-hat from a CJS model based on data collapsed to primary samples. Does anyone have a view on that?

Quick search of forum shows multiple answers to this question. Try the following:

viewtopic.php?f=1&t=189&p=4576&hilit=goodness+of+fit+robust#p4578

[Lyndon]

Thanks Evan. I hadn't found these posts in my search.

[cooch]

Thanks Evan. I hadn't found these posts in my search.

No worries. If I could create a search engine that always yielded exactly what you were looking for, I'd put Google out of business. I'll let you know if that happens.