SPSS® 12.0 Command Syntax Reference

MANOVA: Multivariate 873
DEVIATION Deviations from the mean of the variables being transformed. The first transformed
variable is the mean of all variables in the transformation. Other
transformed variables represent deviations of individual variables from the
mean. One of the original variables (by default the last) is omitted as redundant.
To omit a variable other than the last, specify the number of the variable
to be omitted in parentheses after the DEVIATION keyword. For example,
/TRANSFORM (A B C) = DEVIATION(1)
omits A and creates variables representing the mean, the deviation of B from
the mean, and the deviation of C from the mean. A DEVIATION transformation
is not orthogonal.
DIFFERENCE Difference or reverse Helmert transformation. The first transformed variable
is the mean of the original variables. Each of the original variables except the
first is then transformed by subtracting the mean of those (original) variables
that precede it. A DIFFERENCE transformation is orthogonal.
HELMERT Helmert transformation. The first transformed variable is the mean of the
original variables. Each of the original variables except the last is then transformed
by subtracting the mean of those (original) variables that follow it. A
HELMERT transformation is orthogonal.
SIMPLE Each original variable, except the last, is compared to the last of the original
variables. To use a variable other than the last as the omitted reference variable,
specify its number in parentheses following the keyword SIMPLE. For example,
/TRANSFORM(A B C) = SIMPLE(2)
specifies the second variable, B, as the reference variable. The three transformed
variables represent the mean of A, B, and C, the difference between
A and B, and the difference between C and B. A SIMPLE transformation is not
orthogonal.
POLYNOMIAL Orthogonal polynomial transformation. The first transformed variable represents
the mean of the original variables. Other transformed variables represent
the linear, quadratic, and higher-degree components. By default, values of the
original variables are assumed to represent equally spaced points. You can
specify unequal spacing by entering a metric consisting of one integer for each
variable in parentheses after the keyword POLYNOMIAL. For example,
/TRANSFORM(RESP1 RESP2 RESP3) = POLYNOMIAL(1,2,4)
might indicate that three response variables correspond to levels of some
stimulus that are in the proportion 1:2:4. The default metric is always
(1,2,...,k), where k variables are involved. Only the relative differences
between the terms of the metric matter: (1,2,4) is the same metric as (2,3,5)
or (20,30,50) because in each instance the difference between the second and
third numbers is twice the difference between the first and second.
REPEATED Comparison of adjacent variables. The first transformed variable is the
mean of the original variables. Each additional transformed variable is the
difference between one of the original variables and the original variable