Variable Transformations

Scaling and Translation Transformations

Figure 32.15 shows the transformations that are available when you select Scaling/Translation from the Family list. These transformations are used to center and scale a variable. Equations for these transformations are given in Table 32.5.

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Figure 32.15: Scaling and Translation Transformations


Table 32.5: Description of Scaling and Translation Transformations
  Default Name of  
Transformation Parameter New Variable Equation
center(Y)   Center_Y y-{mean}(y)
stdize(Y)   Stdize_Y See text.
reflect(Y;a) a=0 Reflect_Y 2a - y
a+b*Y a=0, b=1 Linear_Y a+b y

The stdize(Y) transformation transforms the data to have zero mean and unit variance.

The reflect(Y) transformation reflects the data about the value y=a.

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