>
> tdMID.lmer1=lmer(Response~Bias+Day*Step+(1+Day*Step|Subject),data=E1tdMID,fa
> mily="binomial")
>
> and the error message I get is as follows:
>
> Error in if (any(sd < 0)) return("'sd' slot has negative entries") :
> missing value where TRUE/FALSE needed
If an sd (standard deviation) comes out negative then something has
broken somewhere. The random effect specification
1+Day*Step|Subject
Asks for a random intercept for each subject, and a random slope per
subject for: day, step, and the interaction of day and step --- the
error is probably indicative of insufficient data to fit a model this
complicated.
A
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