What did people choose?
Before we fit a model, we want to get a sense for what people choose as a function of each product attribute. The best way to do this is to count how many times a car with a particular feature is chosen. In this exercise, we are going to focus on the transmission feature and count up the number of times chosen cars have manual transmissions versus automatic using the xtabs() function.
Este exercício faz parte do curso
Choice Modeling for Marketing in R
Instruções do exercício
- Change the formula in the
xtabs()function tochoice ~ trans, which means "sum up thechoicevariable for each level of thetransvariable." - Print the
chosen_by_transtable to the console by typing its name. How many times were cars with manual transmissions chosen versus automatic? - Plot the
chosen_by_transobject using thebarplot()function.
Exercício interativo prático
Experimente este exercício completando este código de exemplo.
# Create a table of chosen sportscars by transmission type
chosen_by_trans <- xtabs(___, data = sportscar)
# Print the chosen_by_trans table to the console
# Plot the chosen_by_trans object
barplot(___)