Distribution across loop iterations are used for questions or sections which run in loops. That is, if a particular question needs to be repeated for different brands or products/services. It will calculate the distribution for each iteration.

After a Collection is created, click on 'Analysis Wizard'.

Select a looped question. 

Click on 'Next Step'.

Select 'Loop Distribution'.

Click on 'Next Step'.

Select a chart type.

Click on 'Finish'.

If no chart type is selected, only a crosstab will be generated as in the below example.

Double-click on the analysis header to change the name.

All features of this crosstab will be the same as other 'Analysis Wizard' crosstabs.