A while back someone sent a question to the R-list about total least squares or orthogonal regression or whatever other name it has. I was looking for something today on my computer and found the attached in case that person or anyone else finds it useful. I haven't read it so I can't comment on its usefulness. mark -------------- next part -------------- A non-text attachment was scrubbed... Name: Total_Least_Squares_Methods.pdf Type: application/pdf Size: 133672 bytes Desc: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20120329/d81fb990/attachment.pdf>