Fixed primary parameter values — fixed • Pmetrics

Fix parameter values to be the same in the population.

Usage

fixed(fixed, constant = FALSE, gtz = FALSE)

fixed: The starting value for the fixed parameter.
constant: If FALSE (default), the value for fixed will serve as the initial estimate for a parameter with unknown mean and zero variance. The parameter value will be updated to a final value at convergence or when the maximum number of cycles is reached. If TRUE, the value for fixed will remain unchanged, creating a parameter with known mean and zero variance, i.e. a constant value in the population.
gtz: Greater than zero. If FALSE (default), ensure parameter values remain positive by discarding negative values. Only relevant for parametric analyses, since lower limit of parameter values for nonparametric are strictly controlled by the range.