[R-sig-ME] Including Nested Factor in Repeated Measures Logistic Regression

[ian m s white]

How many trial types are there? How many blocks? Does each subject do each combination of trial type
and block several times?

On 8 Apr 2014, at 19:39, Maxwell Elliott <maxwe128 at umn.edu> wrote:

> 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 at 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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> 
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