topic Re: What is the ELLIPSE statement used to do? in Graphics Programming

What is the ELLIPSE statement used to do?

Jack2012 — Wed, 21 Aug 2013 02:57:56 GMT

Dear,

I am recently used the proc sgplot and found there is a ELLIPSE statement could be used after the scatter plot, after I read the documentation, I still felt confused about the rationale and function of the ELLIPSE. Could anyone help me on this?

Thanks in advance.

Re: What is the ELLIPSE statement used to do?

Fugue — Wed, 21 Aug 2013 06:12:20 GMT

A ellipse is a graphical representation of the area in which a new obs would be expected to appear (at a given probability level, based on the x and y values in your data).

Re: What is the ELLIPSE statement used to do?

Jack2012 — Thu, 22 Aug 2013 02:11:22 GMT

Dear Fugue,

Really appreciated for your help. Could I understand your words as this is a prediction plot at a given significance level based on the given x & y data?

Re: What is the ELLIPSE statement used to do?

Fugue — Thu, 22 Aug 2013 16:59:52 GMT

That would be correct!

Re: What is the ELLIPSE statement used to do?

Rick_SAS — Thu, 12 Feb 2015 13:30:09 GMT

For more information about prediction ellipses, see my blog post "Add a prediction ellipse to a scatter plot in SAS"

For statisticians who need to go beyond the capabilities of the ELLIPSE statement, see the advanced article "Computing prediction ellipses from a covariance matrix"