CSTRUCTURE Subcommand (GENLOG command)

CSTRUCTURE specifies the variable that contains values for computing cell weights, such as structural zero indicators. By default, cell weights are equal to 1.

  • The specification must be a numeric variable.
  • Variables specified as dependent or independent variables in the variable list cannot be specified on CSTRUCTURE.
  • Cell weights are not applied on a case-by-case basis. The weighted mean for a cell is applied to that cell.
  • CSTRUCTURE can be used to impose structural, or a priori, zeros on the model. This feature is useful in specifying a quasi-symmetry model and in excluding cells from entering into estimation.
  • If multiple CSTRUCTURE subcommands are specified, the last specification takes effect.

Example

COMPUTE  CWT=(HUSED NE WIFED).
GENLOG HUSED WIFED WITH DISTANCE
  /CSTRUCTURE=CWT
  /DESIGN=HUSED WIFED DISTANCE.
  • The Boolean expression assigns CWT the value of 1 when HUSED is not equal to WIFED, and the value of 0 otherwise.
  • CSTRUCTURE imposes structural zeros on the diagonal of the symmetric crosstabulation.