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- What is the ELLIPSE statement used to do?

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08-20-2013 10:57 PM

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.

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08-21-2013 02:12 AM

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).

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08-21-2013 10:11 PM

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?

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08-22-2013 12:59 PM

That would be correct!

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02-12-2015 08:30 AM

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"