The 3rd exercise has been posted on the the companion web page. This exercise covers how to create the point biserial correlation coefficient in the R statistical computing program.
This exercise is the R counterpart to exercise CH02EX02 in the book;however it is the third exercise on this blog. The next post will cover how to obtain the phi-coefficient and the rank correlation. Use the data set C02030DT.txt from your book's CD.
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9 months ago
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