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How many people answered the chocolate suvey?

Before we fit a hierarchical model, we should know how many people answered the survey. The person who answered each question in the chocolate data is identified by a number in the Subject variable. We can find out how many people are described in the data by finding the number of levels of the subject variable. The chocolate data is already loaded. levels() returns a vector with the levels of a factor and length() will tell us the length of the vector.

This exercise is part of the course

Choice Modeling for Marketing in R

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Exercise instructions

  • Compute the length() of the levels() of chocolate$Subject.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Determine the number of subjects in chocolate$Subjects
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