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In order to use conversion windows, we need an "activation" event. In an actual experiment it's easy - we just use the date the person sees the experiment. When it's just an idea, we don't have an activation event, so we just ignore the conversion windows in our calculations. I think that's something we might be able to improve though. We could in theory let you specify a custom activation event (e.g. "viewed checkout page") and use that when looking up metric conversions.

This seems like a way to go. But the expected behavior I had in mind was that the activation event was actually the date the user was added to the segment. Say, I want to estimate the sample size for a planned experiment on the pricing page of our website. I can create a segment and named it “Viewed Pricing Page”, where the page_view date is the date the user was added to the segment.

Hi @some-planet-44104 🙂 I was wandering also about the date field, did you mange to set it up? Should it be the date the user was added to the segment?