I would start by having a look at the following Design Blog post, and I know there are a bunch of other posts related to YoY as well, so you may want to hunt some of those down and have a look at them too.
https://community.qlik.com/t5/Qlik-Design-Blog/Year-over-Year-Comparisons/ba-p/1462927
The other place to search is the following:
https://community.qlik.com/t5/QlikView-Documents/tkb-p/qlikview-documents
Quite a few posts there too related to YoY items.
Regards,
Brett
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