[R] graphics: 3D regression plane

[agent dunham]

Dear community, 

Thanks for regr2.plot. I've another question.

When fixing OLS I used training data and test data. 
I'd like to know if it's possible to draw the plane I've fixed with the
training data, and draw the observed and predicted points achieved with the
test data. If so any help or reference would be much appreciated. 

Thanks in advance, user at host.com

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