Fill Missing Values with Means

The Data tab lets you replace missing values with means for selected cells, records or variables:

Highlight the data values for a given variable or the entire column for a selected variable.
Right-click anywhere on the Data tab.
Choose Fill Missing Values with Means from the right-click context menu.
Choose the number of decimal places for the mean value. If the number of decimal places selected results in a value wider than the existing Field Width for the selected variable(s), a message will be displayed indicating that one or more variables had their widths or decimals expanded in order to contain the data. If you select OK on this message dialog, the widths and/or decimals will be expanded. You can check this expansion using the Variables tab for the selected variables.
Optionally, you can enter an Additional value to be treated as missing. For example, you might also want the code value of "1" treated as a missing value and replaced with the mean for a selected variable(s).
Cells with missing values for the selected cells, records or variables will be replaced with the mean value for the associated variable.