Your original comment and my reply are posted under a different article, Deming Regression.

I will look into this when I have a chance. Unfortunately it’s not as high priority as other things. But I will get to it, because I don’t like inaccuracies here.

I would recommend anyone wanting a robust linear regression routine for EXCEL to check out the rather nice spreadsheet provided by Chris Cantrell. Cantrell, C.A., 2008. Technical Note: Review of methods for linear least-squares fitting of data and application to atmospheric chemistry problems, Atmospheric Chemistry and Physics, 8, 5477-5487.
based on work by York and Evensen,2004. Unified equations for the slope, intercept, and standard errors of the best straight line, American Journal of Physics, 72, 367-375.
It’s in the supplemental material of Chris’s paper.
Send him an email and he will send you the spreadsheet.
It fits into the Solver routine of EXCEL.
It provides both the ordinary least squares for comparison as well as the robust regression with 1 sigma uncertainties.

In respnse to your question on trial software that provides deming regressions.
Analyze-it is a add-in for excel.
GraphPad and the new version of Sigmaplot also provide deming regressions.

This is not an April’s Fools prank.

I don’t believe the *simple* Deming regression method provides a CI.

One may Google references suggesting “iteratively reweighted general Deming regression” or “nonparametric jackknife methods” are needed to estimate such confidence intervals. Everything gets more complicated when both X and Y can have meaningful measurement error.

Not sure if Jon will add these to his long list of utilities he’d like to write someday…

What I DON’T see.. and maybe this was not intended to provide … is the 95% CI for the slope and intercept. Clearly in order to decide if method A and B agree, I need those intervals. Am I missing something?
Bill