Model functions

lin() function

lin(f) and l(f)
takes the coding of factor f as a covariate. The function is defined for f being a simple factor, Trait and units. The lin(f) function does not centre or scale the variable.

Motivation: Sometimes you may wish to fit a covariate as a random factor as well. If the coding is say 1 ... n, then you should define the field as a factor in the field definition and use the lin() function to include it as a covariate in the model. Do not centre the field in this case. If the covariate values are irregular, you would leave the field as a covariate and use the fac() function to derive a factor version.

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