How do I calculate the Root Mean Square (RMS) of line of equality

Considering a regression, I don't need the RMS of the trend line but the RMS
of the line of equality

It is generally considered poor form to split an active thread in this
way. Also, your meaning is unclear.

Jerry

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> Considering a regression, I don't need the RMS of the trend line but the RMS
> of the line of equality