By R. Dennis Cook
Covers using dynamic and interactive special effects in linear regression research, targeting analytical pictures. good points new ideas 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 process for linear regression research and will be applied because the major desktop 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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Additional info for An introduction to regression graphics
At this point you can either start regression analysis, save the data and labels to a file, or both. 9,just double click on “X4” and push “Done” to start analysis. ” To save the data and labels, push the button “Save to File” in the regression dialog. When you push the “Done” button, you will get another dialog to choose a name for the data file; the program will automatically add the suffix . l s p to the name you choose. A file created this way can be read by the R-code using the load command, but it is not in a form that is particularly easy for a human to read.
For example, dragging the slider until a 4 appears fits a fourth degree polynomial to the data in the scatterplot. 3. Plot of (temperature,ozone) with the 01s fit superimposed. 2 Residual Plots Another useful graphical method for checking linearity in simple regression is to plot the residuals versus the predictor. This is obtained by clicking on the button labelled “Rem Lin Trend,” which stands for remove linear trend. The vertical axis variable becomes a set of residuals, and the axis label is changed to indicate that the residuals are from the 01s regression with ozone as the response and temperature as the predictor.
Write a summary of your conclusions. 4. The file ais . l s p in the R-data folder contains data on 102 male and 100 female athletes collected at the Australian Institute of Sport. Load this data file, and when the regression dialog appears, specify height Ht as the single predictor and lean body mass LBM as the response, and then click the “Done” button. ” The point labels for these data give the sex and sport of the athlete. 2. Using the “Plot of. ” item from the “BodyMass” menu, construct the plot (Ht, LBM), and identify the sport and sex of the tallest athlete.
An introduction to regression graphics by R. Dennis Cook