[R] Simple Nesting question/Odd error message

[Jarrett Byrnes]

That works, but I am still puzzled as to why
lme(fixed = X.open ~ Dock, random=~Slip%in%Dock, data=my.data)

Does not work.  It yields the error

Error in getGroups.data.frame(dataMix, groups) :
	Invalid formula for groups

Whereas were I to treat slip as a fixed factor

aov(X.open ~ Dock + slipfactor%in%Dock, data=my.data)

works just fine.

Is there something fundamental that I am missing in the syntax?

On Nov 8, 2005, at 2:06 AM, Dieter Menne wrote:

> Jarrett Byrnes <redbeard <at> arrr.net> writes:
>
>> I'm having syntactical issues, however.  When I try
>>
>> dock.lme<-lme(X.open ~ Dock, random=Slip|~Dock, data=my.data)
>>
>> I get
>>
>> Error in inherits(object, "reStruct") : Object "Slip" not found
>>
>
> Syntax is wrong, should be something like
>
> dock.lme<-lme(X.open ~ Dock, random=~Slip|Dock, data=my.data)
>
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