Parameters may be any free parameter or parameters from an MxMatrix object. Parameters may be referenced either by name or by referring to their position in the 'spec' matrix of an MxMatrix
object. To affect an estimation or optimization, an MxBounds object must be included in an MxModel object with all referenced MxAlgebra and MxMatrix objects.
Slots may be referenced with the $ symbol. See the documentation for Classes and the examples in the mxBounds document for more information.