for retention curve graphs, what does “<1 week” mean?

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The "<1 week" in retention curve graphs for Mixpanel refers to users who returned to perform the specified action within less than one week after their initial action. This is sometimes called the "0th interval" or "incomplete bucket" in Mixpanel's terminology.According to the Mixpanel documentation: > Note that we include a "0th" interval for events that take place less than one interval after the initial event.Query API - Retention Methods > retention-query > Parameters Part 2> This interval is important because it captures users who quickly re-engage with your product or service, which can be a strong indicator of initial interest or value found in your offering.It's worth noting that these early retention buckets may still be in flux, as mentioned in the documentation: > Boxes with an asterisk (*) indicate that the data is still in flux and not set yet because the time is still ongoing. Hover over a box to see when the last qualifying date for that bucket will occur.Docs Reports > Retention: Measure engagement over time > Basic Features> Understanding this "<1 week" bucket can be crucial for analyzing early user behavior and engagement, especially for products aiming for frequent, recurring usage.

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