VARIABLES Keyword (PROXSCAL command)

The following keywords may be specified:

INTERVAL. Numerical transformation. In this case, the transformed values of a variable are proportional to the original values of the variable, including free estimation of the intercept.

NOMINAL. Nominal transformation. The values are treated as unordered. The same values will obtain the same transformed values.

ORDINAL. Ordinal transformation. The values of the transformed variable have the same order as the values of the original variable. In parenthesis, the approach to tied values can be specified. Keeping tied values tied, also known as secondary approach to ties, is default. Specification may be implicit, ORDINAL, or explicit, ORDINAL(KEEPTIES). Allowing tied values to be untied, also known as the primary approach to ties, is specified as ORDINAL (UNTIE).

SPLINE. Monotone spline transformation. The transformed values of the variable are a smooth nondecreasing piecewise polynomial transformation of the original values of the chosen degree. The pieces are specified by the number and placement of the interior knots.