Thank you @Sander and @s_doi for your answers. I am still finding it difficult to relate the terms that you use during your explanations to my own terms and prior understanding as summarised in my previous post. For example, I think of the problem of looking at two sets – one representing control and one treatment created by randomisation and which are initially exchangeable. They change subsequently depending on the effects of treatment and control. The subsequent difference between them can be expressed in a number of ways – through RD, RR, SRR, OR or some other way. It would also help me to understand the concept of collapsibility is put into practical use. Perhaps it might be easier for you to help me if you refer to a new topic that I started a few days ago, which describes my way of thinking: Risk based treatment and the validity of scales of effect
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