I read in an article that Ian Cowe said that what normally chemometricians do is to look to the graphics, of course interpret those graphics. So I still go on trying to develop a function can help me to understand the graphics and all the statistics there are behind.
I add some more lines to the monitor function:
I can do the same for the residual plot.
There are two warning lines which advice if the residual exceeds 2,5*SEP value. That is the T value warning limit.
Another line can be add, called the T value action limit (3*SEP).
Graphics show the 0-1 abline (blue) and the calculated slope-intercept abline (red). Limits are with dashed red lines.