QUOTE(Gabbe @ Jan 1 2008, 02:28 AM)

I'm not a statistician...
Clearly!
For starters you've forgotten that it takes two people to make a child, so you are actually assuming every family had 12 kids. You've also forgotten to include an infant mortality rate (but let's ignore that). If you want 25 year generations, 6 at a time, 75 year life expectancy, and no infant mortality, then starting with 57, after 200 years the actual number is 1,080,378 men women and children. The correct formula is 57 * (3^8 + 3^7 + 3^6) * 2, where the 6 has become a 3 to account for the fact that only women give birth, the 2 at the end adds the men back in, we've counted the last 3 generations to get the 75 year life expentancy, and 57 is the original number of people. If you want to use this model and get to 15,000,000 kids you need approximately 11.5 children per family. And remember, this assumes every single child lives until the age of 75 and has that many kids - not a single infant death. Even modern medicine can't do that. If you start considering infant mortality as it was in the ancient world, it gets a lot worse, and if you start thinking about what that would mean for slaves, it's a
lot worse. But in any event you've massively oversimplified things, since children aren't produced at neat 25 year intervals. The actual curve is an exponential, and I used a standard population growth model to produce my results.
QUOTE(Gabbe @ Jan 1 2008, 02:28 AM)

Which all just really boils down to: If you're going to try to prove something using a mathematical formulation, get the formulation right.
Indeed. And while you were somewhat on the right track, you definitely did not have the right formulation. This isn't rocket science - this is the sort of math first year economics majors learn.
QUOTE(Gabbe @ Jan 1 2008, 02:28 AM)

The population growth in Egypt was clearly maaseh nissim, and so the poor Afghanis really have nothing to do with it. Let's try and leave the straw men in Oz.
You can assume it was maaseh nissim, but you haven't exactly been convincing. There's no straw man here - I admit that even 3,000,000 pushes the limits of feasibility, but if it's 15,000,000 you might as well start assuming that there were the 1,500,000,000 necessary for the 1 in 500 medrash.
QUOTE(Gabbe @ Jan 1 2008, 02:28 AM)

I'm not really sure where the number 3 million for yotzei Mitzrayim comes from, because who says everyone was married or had kids?
You'd better hope they did because if they didn't that curve is going to grow a
lot slower...