[R] A basic question in model/formula specification

[telm8]

Hi,

I am currently trying to fit a multinomial logit model on my data. I have
tried to search for some example, and this is the one that I followed and
worked. 

http://www.ats.ucla.edu/stat/r/dae/mlogit.htm

However, I am having difficulties finding out the meaning of the model
specified in the following line:

mlogit.model<- mlogit(brand~1|female+age, data = mldata, reflevel="1")

The main issue is the "|". I found out that it means multi-part formula but
I have no idea what it means mathematically in this particular case. Can
anyone enlighten me?

Many thanks



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