Exercise

# Interaction between price and trial

The `chocolate`

data is still loaded. Next, let's look at an interaction between price and a variable that isn't a product attribute. We don't have any variables describing the user in this data, but we do have the variable `Trial`

, which indicates the order of the 25 choice questions that each respondent answered. They are numbered 1 through 25.

Instructions

**100 XP**

- Add a formula to the
`mlogit()`

call for a model with`Brand`

,`Type`

,`Price`

, and the interaction between`Price`

and`Trial`

. Don't forget to leave out the intercept. - Use summary to see the model coefficients for
`choc_m5`

. Find the coefficients for the interaction.