User Guide

196
Chapter 8

Cases with zero, negative, or missing values for the weighting variable are
excluded fr
om analysis.
 Fractional
values are valid; they are used exactly where this is meaningful and
most likely where cases are tabulated.
Figure 8-14
Weight Cases dialog box
Once you apply a weight variable, it remains in effect until you select another weight
variable
or turn off weighting. If you save a weighted data file, weighting information
is saved with the data file. You can turn off weighting at any time, even after the
file has been saved in weighted form.
Weights
in Crosstabs.
The Crosstabs procedure has several options for handling case
weights. For more information, see “Crosstabs Cell Display” in Chapter 16 on p. 334.
Weights in scatterplots and histograms. Scatterplots and histograms have an option for
turning
case weights on and off, but this does not affect cases with a zero, negative, or
missing value for the weight variable. These cases remain excluded from the chart
even if you turn weighting off from within the chart.
To Weight Cases
E From the menus choose:
Data
Weight Cases...
E
Select Weight cases by.
E Select a frequency variable.