# An introduction to regression graphics by R. Dennis Cook

By R. Dennis Cook

Covers using dynamic and interactive special effects in linear regression research, concentrating on analytical portraits. good points new innovations like plot rotation. The authors have composed their very own regression code, utilizing Xlisp-Stat language known as R-code, that is an almost entire procedure for linear regression research and will be applied because the major machine software in a linear regression path. The accompanying disks, for either Macintosh and home windows desktops, include the R-code and Xlisp-Stat.

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Two of the variables in this data set are ozone concentration (Ozone) in parts per billion and the maximum daily temperature (Temp) in degrees Fahrenheit. The data on ozone concentration used earlier in this chapter were collected over a full year in the Los Angeles area in 1976. Load the data file, and in the regression dialog specify Ozone as the response and Temp as the single predictor, and then push the “Done” button. From the resulting “Air” menu, use the “Plot of. . ” item to draw the plot (Temp, Ozone).

Missing values are not permitted. l s p in the R-data folder. On the Macintosh, you can view or edit the file using the built-in editor in Xlisp-Stat. Select the item “Open Edit” from the “File” menu, and then from the resulting dialog open the R-data folder and select the file halddata . l s p . 1. In the Windows version, there is no built-in editor, but there is a separate application called LSPEDZT that is similar to the Macintosh editor. You can of course use any editor or word processor, but all data files must be saved as plain text files.

To remove the coordinates, shift-click again on the data point. To return to the selecting mode, choose “Selecting” from the “Mouse Mode” dialog. 5 LINKING PLOTS Linking refers to tying two or more plots together, so that actions such as focusing, selecting, and deleting points in one plot are automatically applied in the others. The applicability of linking plots in simple regression problems is somewhat limited, but the birth rate data provide a convenient opportunity to introduce the idea. 5 LINKING PLOTS 43 00000000000000000000 55 60 65 Year 70 a.