This article describes how to go from a crosstab...
...to a table with the Column n displayed in the column labels:
1. Select your table.
2. In the toolbar go to Automate > Browse Online Library > Modify Headers > Add Column Sample Size to Column Labels.
3. Enter the desired prefix text in Text to show in header that will appear in front of each sample size figure. By default this is n =.
4. OPTIONAL: Tick Show weighted sample size (Population) if you have a weight applied to your table and wish to display the weighted sample size instead.
5. Press OK.