Mary Phipps, Malcolm Quine's A Primer of Statistics PDF

By Mary Phipps, Malcolm Quine

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Mean. 1 Flow control Until now, we have seen components of the R language that cause evaluation of single expressions. However, R is a true programming language that allows conditional execution and looping constructs as well. Consider, for instance, the following code. 1081 > x^2 [1] 12345 Notice the while(condition) expression construction, which says that the expression should be evaluated as long as the condition is TRUE. The test occurs at the top of the loop, so the expression might never be evaluated.

Unfortunately, R defaults to treating the levels as if they were equidistant in the modelling code (by generating polynomial contrasts), so it may be better to ignore ordered factors at this stage. 9 Lists It is sometimes useful to combine a collection of objects into a larger composite object. This can be done using lists. You can construct a list from its components with the function list. As an example, consider a set of data from Altman (1991, p. 183) concerning pre- and postmenstrual energy intake in a group of women.

In particular, it can be used in batch processing. The way it works is as follows: > sink("myfile") > ls() No output appears! This is because the output goes into the file myfile in the current directory. The system will remain in a state where commands are processed, but the output (apparently) goes into the drain until the normal state of affairs is reestablished by > sink() The current working directory can be obtained by getwd() and changed by setwd(mydir), where mydir is a character string.

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