Nicholas J Tierney

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OBJECTIVES Demonstrate the application of decision trees--classification and regression trees (CARTs), and their cousins, boosted regression trees (BRTs)--to understand structure in missing data. SETTING Data taken from employees at 3 different industrial sites in Australia. PARTICIPANTS 7915 observations were included. MATERIALS AND METHODS The(More)
Writing functions in R is an important skill for anyone using R. S3 methods allow for functions to be generalised across different classes and are easy to implement. Whilst many R users are be adept at creating their own functions, it seems that there is room for many more to take advantage of R's S3 methods. This paper provides a simple and targeted guide(More)
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