A contrast of a factor of lmer's fixed effects: R's contr.treatment, contr.sum, contr.helmert or contr.poly (orthogonal polynomials in the level scores 1, 2, ..., columns .L, .Q, .C, ^4, ...).
contr.treatment
contr.sum
contr.helmert
contr.poly
.L
.Q
.C
^4
A contrast of a factor of lmer's fixed effects: R's
contr.treatment,contr.sum,contr.helmertorcontr.poly(orthogonal polynomials in the level scores 1, 2, ..., columns.L,.Q,.C,^4, ...).