With proper points justify the statement for the legend the statement is all about.
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What is the statement for the question
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RACT A graph with both left and right vertical axes is easy to construct using SAS/GRAPHâ PROC GPLOT with multiple plot statements. Producing a correct legend requires some additional coding. Options for creating the legend are provided in this paper. Using the LEGEND statement requires an extraneous plot be hidden, thus providing information for the legend. This option is useful if you can hide a symbol within a symbol (i.e., dashed line and solid line or circle and dot). Another option is to use the FOOTNOTE statement to simulate a legend. For this option to work, symbols used in the graph must be reproduced in the footnote legend. INTRODUCTION Producing a graph with multiple plot statements using PROC GPLOT can cause the LEGEND option to print an incomplete list. Three options are given for creating a complete legend when using multiple plot statements and the OVERLAY option. The first option is to create an extra plot grouping which will complete the legend. Another option is to use symbols that can be added to the FOOTNOTE statement; this will appear as the legend. The final option, which is not a great solution, is to produce the correct graph with no legend and then paste a correct legend from an incorrect graph. The specific examples in this paper use variables Year (YEAR), Observed Count (OBS), Expected Count (EST), Temperature Adjusted Count (TEMP) and Water Level (WLEV). The expected counts and water levels are shown as joined symbols (polylines). Observed and expected counts are shown as symbols only. METHOD Option A – Hidden symbol Two of the plotting pairs (displayed using different symbols) on the first plot statement must be identical in order to produce a correct legend. For this example, one of the symbols is a solid line and the other a dashed line. When the completed graph is viewed the solid line conceals the duplicate dashed line. The dashed line that is seen in the graph is actually from the second plot statement. The plot statements look like: PLOT EST*YEAR=1 OBS*YEAR=2 TEMP*YEAR=3 EST*YEAR=4 / OVERLAY HAXIS=AXIS1 VAXIS=AXIS2 LEGEND=LEGEND1; PLOT2 WLEV*YEAR=5 / HAXIS=AXIS1 VAXIS=AXIS3; Note: Symbol 1 diamonds joined by solid line Symbol 2 dot Symbol 3 circle Symbol 4 dashed line Symbol 5 dashed line Creating the legend is a simple matter of specifying the correct labels. The dashed line shown in the legend is actually produced due to the hidden line but is labeled with the variable name in the second plot statement. The legend statement specifies variable labels as well as positioning the legend. LEGEND1 LABEL=(POSITION=(BOTTOM RIGHT)) VALUE=(‘PREDICTED’ ‘OBSERVED’ ‘TEMPERATURE ADJ.’ ‘WATER LEVEL’); Plot A shows the graph produced from this coding structure. Option B – Footnote It is difficult to reproduce the exact look of the generated legend but a footnote can be set to show symbols and corresponding variable names. Use symbols that are obtainable on the keyboard, do not use dot or circle, as these are not readily available. The FOOTNOTE statement can be structured in the desired format. Because the legend will be incomplete, the graph is produced using the NOLEGEND option. The following code shows the necessary statements. PLOT EST*YEAR OBS*YEAR TEMP*YEAR/ OVERLAY NOLEGEND HAXIS=AXIS1 VAXIS=AXIS2; PLOT2 WLEV*YEAR / NOLEGEND HAXIS=AXIS1 VAXIS=AXIS3; The symbols used can be defined in the symbol statements or assigned as macro variables and referenced in the symbol and footnote statements. Peter Ruzsa at SAS Institute provided the original code for this option; I have modified the code for use in this paper. Plot B demonstrates the output form for this type of coding. Option C – Paste The last resort option is to produce the correct graph with two plot statements using the NOLEGEND option. Then produce a graph with one plot statement and LEGEND option. Use this correct legend and paste it on to the graph. Plot C first shows the correct graph and then the incorrect graph with correct legend. Pasting can be Posters
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