Variables:
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dept_abbr - Course department (abbreviated).
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course - Course number.
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ibsn - Book ISBN.
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ucla_new - New price at the UCLA Bookstore.
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amaz_new - New price on Amazon.com.
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more - Whether additional books were required for the course (Y means "yes, additional books were required").
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diff - The UCLA Bookstore price minus the Amazon.com price for each book.
Details
The sample represents only courses where textbooks were listed online through UCLA Bookstore's website. The most expensive textbook was selected based on the UCLA Bookstore price, which may insert bias into the data; for this reason, it may be beneficial to analyze only the data where more is "N".