On 2010-03-07 10:41, cmc wrote:
I have tried doing it whithout attaching the mydata file, and i still get the
same output.
When i create mldata using mlogit.data i do not generate the chid and alt
columns, is this where the problem is, if so how do i fix this problem.
I've suggested not naming the mlogit.data object 'mldata'. That will
work. Another way is to let mlogit() do the data conversion itself:
Instead of
mldata<-mlogit.data(mydata, varying=NULL, choice="brand", shape="wide")
mlogit.model<- mlogit(brand~1|female+age, data = mldata, reflevel="1")
use
mlogit.model <- mlogit(brand~1|female+age,
data = mydata, ## note: 'mydata', not 'mldata'
reflevel = "1",
varying = NULL,
choice = "brand",
shape = "wide")
-Peter Ehlers
Cheers for any help
--
Peter Ehlers
University of Calgary
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