By R. Dennis Cook
Covers using dynamic and interactive special effects in linear regression research, targeting analytical snap shots. positive factors new ideas like plot rotation. The authors have composed their very own regression code, utilizing Xlisp-Stat language referred to as R-code, that is a virtually entire approach for linear regression research and will be applied because the major desktop application in a linear regression direction. The accompanying disks, for either Macintosh and home windows pcs, comprise the R-code and Xlisp-Stat.
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Additional info for An introduction to regression graphics
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.
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.
Selecting the points with Sex equal to 0 selects only the male athletes. You can now use the “Focus on Selection,” “Remove Selection,” and “Show All” items in the plot’s menu or in the histogram’s menu to study the dependence of LBM on Ht for males and females separately. 4 provide a report on your study, including the necessary graphical support. 2. Use the “New Model. . ” item to set up the regression structure with %Bfut, percent body fat, as the single predictor of LBM. 4 for these data. Investigate the distribution of LBM given %Bfat, separately for males and females, and summarize your results.