Obsidian | Level 7

polar plot with bias

Hello,
I am looking to graph a Polar plot for Δ between 2/3 methods. I read a lot of things but I am not sure of the great method to use and fear to do mistakes.

My aim is to represent the same polar plot that the pict.

I need to :
- plot points (mean of Δ for each individue);
- plot one line to represents the bias;
- other to ±30° lines;
- get the angular bias

Best

5 REPLIES 5
SAS Super FREQ

Re: polar plot with bias

A discussion of polar plots is available at this blog post from 2012. It uses the Graph Template Language (GTL). Since then, a lot of additions have been made to PROC SGPLOT, so you can read a newer article about how to create similar polar plots with PROC SGPLOT.

Obsidian | Level 7

Re: polar plot with bias

@Rick I read them but i don't undernstand how can i use them to plot my situation... (already tested)
SAS Super FREQ

Re: polar plot with bias

In general, the more information you provide, the more the community can help. Post your data and what you have attempted so far.

Super User

Re: polar plot with bias

@Mic35 wrote:

Hello,
I am looking to graph a Polar plot for Δ between 2/3 methods. I read a lot of things but I am not sure of the great method to use and fear to do mistakes.

My aim is to represent the same polar plot that the pict.

I need to :
- plot points (mean of Δ for each individue);
- plot one line to represents the bias;
- other to ±30° lines;
- get the angular bias

Best

Do you already know the value of the line you need or are you expecting the plot procedure to estimate the bias? I doubt that a general plotting procedure will do that sort of fitting but may be wrong. Otherwise you may need to provide example data and the process for estimating the bias line.

I will admit that I am not familiar with this concept at all. But I really doubt that any plotting procedure can "get the angular bias". Likely that will have to be done separately.

Obsidian | Level 7

Re: polar plot with bias

I think i didn't give all informations.
The polar plot arrive after Bland-Altman step and four-quadrant
Process sometimes use in anesthesia - cardiology studies
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