By R. Dennis Cook

Covers using dynamic and interactive special effects in linear regression research, targeting analytical images. positive aspects new recommendations like plot rotation. The authors have composed their very own regression code, utilizing Xlisp-Stat language referred to as R-code, that's an almost entire process for linear regression research and will be applied because the major laptop application in a linear regression direction. The accompanying disks, for either Macintosh and home windows desktops, comprise the R-code and Xlisp-Stat.

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**Extra info for An introduction to regression graphics**

**Sample text**

2 are visual aids that enable us to focus on the data in question. Later we will make quantitative use of the slices, but for now it seems clear that the mean of the response for the slice at x = 40 is less than the mean for the slice at x = 80. The same may be true for the variances as well. 2 can be constructed by first selecting the points that roughly correspond to the slice at x = 40 and then, with the Shift key depressed, selecting points that correspond to the slice at x = 80. Depressing the Shift key will cause the points selected at x = 40 to remain selected while the other points are selected.

These functions now depend on p arguments, the values of the individual predictors. We have deliberately used the same symbol x to represent a vector of predictors in a p-predictor problem or a single predictor in simple regression. We will view regression with one predictor as the special case when p = 1. When p = I, the 2D plot (x,y ) provides a fairly complete summary of a regression problem. When p = 2, a 3D plot of the predictors versus the response can serve the same purpose. The 3D plot uses motion to view the third dimension, as described in the next few chapters.

The brain weight data are from Weisberg (1985, p. 144). lsp can also be obtained by loading a file from the R-data folder. 1sp,and the later birth rate data are in the file birthrt2 . l s p . 1sp. 1. 8 by using the graphical tools discussed in this chapter. Is it really true that the highest birth rate always occurred in September? Which month tends to have the lowest birth rates? 2. 7. Which species has the highest brain weight and the highest body weight? Which species has the lowest brain weight and body weight?