A variable is included in the solution when it is in the
range and selected (versus in-the-range and
not selected). A variable is selected
by setting the variable type (often referred to as the
Vtyp) on row two (2). Regression problems recognize the following
entries:
·
I - for independent variable.
·
D - for dependent variable (only
one is allowed).
·
F - for forced variable
(used in the stepwise procedure).
·
C - for case selection. Wherever a period is entered in this column, the entire row
containing the period is omitted in the solution procedure (case deletion).
· G - used to indicate dummy variables. Variables with this type are NOT automatically transformed in WinORS. For example, in a logarithmic transformation of a data file, any column with a G variable type is skipped over (left unaltered).
·
W - indicator for Weighted
Ordinary
Least
Squares. The data in this
column must be included in the range and will be used to
'weight' the variables. This is not a
decision-making (or predictor) variable, hence, no parameter estimate (or other statistics) are generated for a variable with this
type. This variable is added
automatically in the file WGHTOLS.OR?.