I have still been unable to solve this issue. Any help related to dealing
with nested variables in lmer regression would be uch appreciated.

-Max Elliott


On Tue, Apr 1, 2014 at 2:14 PM, Maxwell Elliott <maxwe128@umn.edu> wrote:

> Hello,
>
> I am attempting to model accuracy in a task that contains multiple trial
> types, multiple blocks and many subjects. It is a repeated measure design
> because each subject completes 160 trials. My current formula for the
> regression is this:
>
> Accuracy ~ TrialType * Block + (1 | subjectNumber)
>
> I am now trying to include a symptom measure in the design. This measure
> will be the one continuous value for each subject. So the symptom measure
> is nested within subject. What is the syntax for including this symptom
> measure in the design. I want to know if the symptom measure contributes to
> model fit and if higher values increase or decrease the likelihood of
> answering the the trial correctly. I know I cannot do this:
> Accuracy ~ TrialType * Block * Symptom + (1 | subjectNumber)
> , because symptom is nested within subject but I am not sure what else to
> do.
>
> Thanks for the help,
>
> Max Elliott
>



-- 

-Max

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