Weights tab (Edit Banner)

Weighting is a standard practice for survey data analysis. See Weighting example for an example of how weighting is used.

Weights can be created in any of the following ways:

Weight variables can be a part of your original data file.
Weight variables can be added to your original data file or a new data file using Simple Weighting or Sample Balancing.
Use Glossary Variables to create weighted variables.
Specify an actual value for a weight when you set up banners.

The following is an example of using the glossary variable method:

To create a weight for the GENDER variable using Setup|Glossary Variables, use ADDLEN to add columns to the end of your data. You will have had to already calculate the weights you want to apply. When determining field width, make sure to include a position for the decimal point. Assuming GENDER (1) = Male and GENDER (2) = Female, you might enter the following in the Setup Glossary Variables dialog box:

ADDLEN 10

IF GENDER (1) ASSIGN WEIGHT = (1.250)
IF GENDER (2) ASSIGN WEIGHT = (0.833)

The gender weights will now be stored in the variable WEIGHT. In this example, the WEIGHT variable already existed in the original data file.

Whichever method you use to create them, all weights are specified on the Weights tab in Setup|Banners|Edit Banner:

Weights can be specified with an actual weight value or with the variable name or record/column location that holds the actual weight value.
An actual weight can have up to 12 digits, can be positive or negative and can have decimal places.
Weight variables must be a minimum width of 5.

Select the Weights tab from Setup|Banners|Edit Banner:

Select the column(s) for weighting in the Columns list box.
Enter the actual value or the variable name or record/column location for the weight variable in the Weight variable field.
If you specify a variable name or record/column location rather than an actual weight and you do not have implicit decimals in the data, you must specify the number of decimals to be implied in the weight variable.
Enter the number of decimal places in the Implied decimal places in weight field. This option lets you specify the decimal place when your data variable does not include an actual decimal point.
Choose Apply to Selected Column(s) to apply the weight entered to the selected columns. The number of weighted columns is displayed so that you know how many of your banner columns are weighted.
Choose Apply to All Columns to apply the weight entered to all banner columns without having to select columns from the Columns list box.
The Columns list box will display a "[w]" next to each weighted column for easier identification of those columns in the banner that are weighted.

Remove Weights from Selected Columns

Select the column(s) for removing weights in the Columns list box.
Select the Remove Weights from Selected Columns button to remove weights from the selected banner columns.