topic Re: proc gradar in Graphics Programming

proc gradar

catch18 — Sun, 19 Jan 2020 05:47:30 GMT

Hi,

I'm trying to make a radar plot with the below code;

proc gradar data=work.Loadings1;

chart food_groups /sumvar=loading

overlay=factor

NOFRAME height=2.0 STARSTART='12:00'T

cstars=(red, yellow, green)

starcircles=(-1,-0.5, 0, 0.5, 1)

wstar=2 2 2

wstarcircles=2 2 2

lstarcircles=1 1 1

lstars=1 1 1

cstarcircles=ltgray;

run;

quit;

Everything works fine, except I have about 57 variables and the labels of these on spokes outside overlap. I'm not sure how else to explain but I could attach an image if needed. Thanks

Re: proc gradar

GraphGuy — Thu, 23 Jan 2020 18:48:14 GMT

57 spokes on a radar chart is a bit much!

I would recommend that maybe a radar chart isn't the best choice for representing so much data.

Perhaps a horizontal bar chart, with 57 bars instead?

Re: proc gradar

Cynthia_sas — Sat, 25 Jan 2020 23:29:06 GMT

Hi:

I tend to agree - 57 is a lot to display on a gradar chart. Even if you do an AXIS statement and rotate the labels, with 57, even rotated, I am afraid that the rotation would not resolve all the collision issues.

SAS/GRAPH does not have the label collision routines that are found in ODS GRAPHICS, so the only extra control you have would be to use ROTATE or to use ANNOTATE. Either way, with 57 values, it's not a trivial programming process.

This is an example of using the SG procedures and the POLYGON statement to do a RADAR chart in a panel plot: https://blogs.sas.com/content/graphicallyspeaking/2013/11/27/is-there-a-car-on-your-radar/ . There might be some ideas here.

I'm not on a computer where I can run any code right now, but I think the horizontal bar chart idea is a good one. If the data has groups, the bars can be grouped or if you use SGPANEL, can be paneled by groups.

Hope this helps,

Cynthia

Re: proc gradar

catch18 — Sun, 26 Jan 2020 00:33:03 GMT

Thanks for your suggestions, Robert and Cynthia.