How do people value white chocolate?
With effects coding, we can find the parameter for the left-out level as the negative sum of the parameters for the other levels of the factor. Let's compute the value of White chocolate using this rule. choc_m7
is still loaded.
This exercise is part of the course
Choice Modeling for Marketing in R
Exercise instructions
- The coefficients for the levels of
Type
are in positions 5 to 8. Select these coefficients and print them to confirm. - Compute the negative sum of those coefficients. This is the coefficient for the left-out
White
type.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# print the coefficients
# compute the negative sum of those coefficients