- Thread starter noetsi
- Start date

to add to what Jake said, often the intercept is not interesting exactly because it is the meyn Y value at X=0 where X=0 might not make sense or be of any larticular interest. If the variable is centered then the intercept is the mean Y at the mean X - which, at least makes practical sense and has more chance of being a practically interesting value as we sampled around it.

Also, I think but am not sure, the requirement to build hierachical models is moot if the IVs are centered. Any opinion on that?

regards

I thought there might be some theoretical reason like when you center the data to make the intercept make substantive sense.