10.1 Kitchen sink model. We can extend the lm(y~x) function to construct a more complicated “formula” for the multi-dimensional model: lm(y ~ x1 + x2 + ... + xn ).This tells R to find the best model ...

A regression model on the fixed effects of a rows, p columns, and a + p – 1 diagonals induces a singular design matrix and yields multiple estimators, leading to parameter identifiability problem in ...