According to my archive digging, this issue comes up again and again. I
was just wondering whether somebody had code lying around for a Deming
Regression or a MLFR method for this, which I might peruse. I came
across a post from Brian Ripley stating that something like it was close
to be included into MASS a couple of times and was wondering whether it
made the cut there (or elsewhere) in the meantime ...
Any hint is greatly appreciated.