Using R for Introductory Statistics : John Verzani

Bivariate data 83> plot(height, weight, pch=as.character(gender))> detach(kid.weights)Figure 3.8 Height versus weight forkid.weightsFigure 3.8 indicates that weight may be related to the height squared. It certainly does notappear to be a straight-line relationship.Arguments for the plot() function The plot() function, and other graphing functionslike hist(), boxplot(), and lines(), take extra arguments that can control portions of thegraphic. Table 3.7 list some of the possible arguments. More details are found on the helppages for the individual functions. Most of these arguments are graphics parameters thatmay also be queried and set using par(). The documentation for these arguments is foundin the help page for par(). (This function is discussed more fully in Appendix D.) Some ofthe arguments, such as main=, xlim=, and xlab=, can be used only with plottingfunctions that set up a plot window (called high-level plotting functions).Table 3.7 Useful arguments for plot() and othergraphic functionsmain= Title to put on the graphic.xlab= Label for the x-axis. Similarly for ylab=.xlim= Specify the x-limits, as in xlim=c(0, 10), for the interval [0, 10].Similar argument for the y-axis is ylim=.type= Type of plot to make. Use "p" for points (the default), "1" (ell not one) for lines, and "h" forvertical lines.bty= Type of box to draw. Use "l" for “L”-shaped, default is "o", which is “O”-shaped. Details in?par.pch= The style of point that is plotted. This can be a number or a single character. Numbersbetween a and 25 give different symbols. The command plot (0:25, pch=0:25) will showthose possible.cex= Magnification factor. Default is 1.lty= When lines are plotted, specifies the type of line to be drawn. Different numbers correspondto different dash combinations. (See ?par for full details.)