PLOT <data> / TYPE=DRAFTS plots the draftsman's display, i.e. all pairwise scatter plots of m active variables as an m x m array of graphs. The output can be limited to the upper triangle of the array by TYPE=DRAFTS,UPPER or to the lower triangle by TYPE=DRAFTS,LOWER . All normal specifications related to the size and the location of the graph are available. Also the POINT specification can be used as in standard scatter plots (see POINT?). The scaling of variables is determined automatically according to the minimum and maximum values of the current data. Discrete variables with few possible values (normally producing uninformative plots because many points overlap) can be jittered (scattered) by entering a specification JITTER=k. Then variables with at most k distinct values are randomized uniformly around the true values within a total interval (jitter step) of (max-min)/(h-1) where h is the number of distinct values. The ranges of the variables and their jitter steps can be saved in a text file by a specification OUTSCALE=<name_of_file>. The automatic settings of ranges and jitter setps may be changed by editing this file and reproducing the plots with a specification INSCALE=<name_of_file>. OUTSCALE and INSCALE are also helpful when partial data sets with different point symbols are to be overlaid as seen from the following example. (Activate the GPLOT schemes on the next page in the given order.) Example of a draftsman's display ................................................................................ Plotting the whole data (spefifying scalings and jittering): GPLOT FINLAND / TYPE=DRAFTS OUTSCALE=SCALES.TXT JITTER=30 XDIV=0,1,0 YDIV=0,1,0 HEADER= MASK=--AAAAAAAAAA-A ................................................................................ Plotting small communes (black dots by default): GPLOT FINLAND / TYPE=DRAFTS HEADER= XDIV=0,1,0 YDIV=0,1,0 INSCALE=SCALES.TXT MASK=--AAAAAAAAAA-A IND=Popul,0,8000 OUTFILE=A ................................................................................ Plotting large communes (red dots added to the previous graph): GPLOT FINLAND / TYPE=DRAFTS HEADER= XDIV=0,1,0 YDIV=0,1,0 INSCALE=SCALES.TXT MASK=--AAAAAAAAAA-A IND=Popul,8001,500000 POINT=[RED],0,0 INFILE=A OUTFILE=A ................................................................................ Plotting one particular case (large green dots on the previous graph): GPLOT FINLAND / TYPE=DRAFTS HEADER= XDIV=0,1,0 YDIV=0,1,0 INSCALE=SCALES.TXT MASK=--AAAAAAAAAA-A CASES=Commune:Helsinki POINT=[GREEN],0,3 INFILE=A (This can be replotted for any other cases.) ................................................................................ M = more information on multivariate plotting

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