Contrasts can be specified in the regression models with the following functions:
COMPARISON |
Comparisons amongst the levels of a factor |
|---|---|
POL |
Polynomial contrasts of factor levels or of variate values |
REG |
Contrasts specified by a matrix of coefficients for factors or by a transposed data matrix for variates, also orthogonal polynomials |
Smoothing of explanatory variates in a linear or generalized linear model can be specified by the function:
LOESS |
Locally weighted regression effect of a variate (synonym LO) |
|---|---|
SSPLINE |
Smoothing spline effect of a variate (synonym S) |