We have seen the use of the pre-multiplication mechanism (using the
* operator) a number of times: to fix a parameter, to provide a starting value, and to label a parameter. We refer to these operations as modifiers, because they modify some properties of certain model parameters. More modifiers will be introduced later.
Each term on the right hand side in a formula can have one modifier only. If you must specify more modifiers for the same parameter, you need to list the term multiple times in the same formula. For example:
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