MODEL Subcommand (PROXSCAL command)

MODEL defines the scaling model for the analysis if more than one source is present. IDENTITY is the default model. The three other models are individual differences models.

IDENTITY. Identity model. All sources have the same configuration. This is the default model, and it is not an individual differences model.

WEIGHTED. Weighted Euclidean model. This model is an individual differences model and equivalent to the INDSCAL model in the ALSCAL procedure. Each source has an individual space, in which every dimension of the common space is weighted differentially.

GENERALIZED. Generalized Euclidean model. This model is equivalent to the GEMSCAL model in the ALSCAL procedure. Each source has an individual space that is equal to a rotation of the common space, followed by a differential weighting of the dimensions.

REDUCED. Reduced rank model. This model is similar to GENERALIZED, but the rank of the individual space is equal to n. This number is always smaller than the maximum number of dimensions and equal to or greater than 1. The default is 2.

• If IDENTITY is specified for only one source, this subcommand is silently ignored.
• If an individual differences model is specified for only one source, a warning is issued, and the model is set to IDENTITY.

Example

PROXSCAL object01 TO object07 
  /MODEL=WEIGHTED.

• A weighted Euclidean model is fitted, but only when the number of cases in the active dataset is a multiple of 7, starting from 14 (14, 21, 28, and so on). Otherwise, there is only one source, and the model is set to IDENTITY.