interesting read. although your data suggest that, at the moment, sales are evolving linearly, that is not what I would have expected. From the speed the first 7M sold out, I would have guessed that it was a very fast start. We are now in a linear phase, but there could be some sort of saturation (most people spent what they intended) so I would expect a sigmoid curve and not a linear one. Have you tried to fit that to your data? Anyhow, interesting that there will be plenty of chances to buy some more packs :-).
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There's definitely not enough data to fit a sigmoid. My best guess at this point is that it's gonna be pretty linear, with increases in rates leading up to each 1M mark, and then dropping back down right after. So once I have data through 8M sold, I think that model will do a very good job of predicting sales overall. I do think what is here overestimates the total time as a result. I wish I had collected data a few days earlier, as that would at least include the buildup to 7M.