Use Multiple Colors in a Graph

[djbateman]

I am attempting to make a "waterfall" plot with the NEEDLE interpolation in PROC GPLOT.  My plot is divided into two different groups.  I wanted the positive group to be blue and the negative group to be red.  Here is what I have attempted:

axis1 label=(angle=90 'Best Percent Change in Lesion Size') order=(-100 to 150 by 50) minor=(n=4);

axis2 label=(' ') value=none major=none minor=none;

proc gplot data=waterfall;

     plot ploty1*n ploty2*n / overlay vaxis=axis1 haxis=axis2;

     symbol1 interpol=Needle value=none width=4 color=blue;

     symbol2 interpol=Needle value=none width=4 color=red;

run;

I am not at all familiar with annotations, but I am sure I could do something with that.  I just have no idea where to start.

This is not my full data, but here is an idea of how it looks:

brpercent	posneg	n	ploty1	ploty2
2.564	Positive	1	2.564
2.083	Positive	2	2.083
1.333	Positive	3	1.333
0	Positive	4	0
-5.263	Positive	5	-.263
-30	Positive	6	-30
-31.429	Positive	7	-31.429
-36.842	Positive	8	-36.842
-40	Positive	9	-40
-50	Positive	10	-50
150	Negative	11		150
142.857	Negative	12		142.857
78.152	Negative	13		78.152
58.065	Negative	14		58.065
52.174	Negative	15		52.174
-3.704	Negative	16		-3.704
-4	Negative	17		-4
-4.762	Negative	18		-4.762
-7.143	Negative	19		-7.143
-18.75	Negative	20		-18.75

[GraphGuy · Accepted solution]

Here's an example where I've used Proc Gchart and Annotate to create a waterfall chart - I think you can re-use this technique to get the graph you're wanting...

http://robslink.com/SAS/democd41/waterfall_anno.htm

http://robslink.com/SAS/democd41/waterfall_anno_info.htm