I am trying to run Multivariate Statistical Process Control using MSQC package.
My data has corelated variables (temperature readings), which remain corelated most of the time when the process is in control but may not remain that when when something goes wrong.
I think I get this error may be because of the correlated error.
Error in solve.default(S[b, b]): Lapack routine dgesv: system is exactly singular: U[2,2] = 0\n"
How do I resolve this issue ?
