fixpar_freepar function

Parameters modification

The fixpar function can be used to fix a parameter to some value (Typically zero), and the freepar function can be used to free a parameter from being fixed to a value.

fixpar(x, matrix, row, col, value = 0, group, verbose, 
        log = TRUE, runmodel = FALSE, ...)

freepar(x, matrix, row, col, start, group, verbose, log =
        TRUE, runmodel = FALSE, startEPC = TRUE, ...)

Arguments

• x: A psychonetrics model.
• matrix: String indicating the matrix of the parameter
• row: Integer or string indicating the row of the matrix of the parameter
• col: Integer or string indicating the column of the matrix of the parameter
• value: Used in fixpar to indicate the value to which a parameters is constrained
• start: Used in freepar to indicate the starting value of the parameter
• group: Integer indicating the group of the parameter to be constrained
• verbose: Logical, should messages be printed?
• log: Logical, should the log be updated?
• runmodel: Logical, should the model be updated?
• startEPC: Logical, should the starting value be set at the expected parameter change?
• ...: Arguments sent to runmodel

Returns

An object of the class psychonetrics (psychonetrics-class )

Author(s)

Sacha Epskamp