Yes, you're right. That's why I've called the model "simplistic". It already has lots parameters to deal with and, more important, it consistently underestima

Yes, you're right. That's why I've called the model "simplistic". It already has lots parameters to deal with and, more important, it consistently underestimates your userbase - which is good while you're planning. Though, point taken, soon I'll post an updated version.