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That sounds right, as far as it goes. (I likewise assume a sister doesn't ruin 'only son' status, and that we don't know someone is male). Another line of thou
by yesenadam 8y ago
That sounds right, as far as it goes. (I likewise assume a sister doesn't ruin 'only son' status, and that we don't know someone is male).
Another line of thought, possibly just a line of confusion:
Assume "someone", S, is the OS of an OS of an OS. Look at the siblings of S's grandfather - he could have had any number of sisters, but had no brothers. The probability of that situation occurring goes down with each increase in the number of sisters. So maybe an exact answer can be given, a formula including terms for the number of sisters each of the 3 OSs have? (not forgetting the probability that S is also female)
- eruci 8y agoSomeone can be an only son regardless of the number of sisters he has
- yesenadam 8y ago>Someone can be an only son regardless of the number of sisters he has Yes, that's what my point was - "he could have had any number of sisters" - if you have 12 sisters, it's extremely unlikely you are an only son. The more sisters, the more unlikely being an only son is.
- eruci 8y agoYep, but the whole trick is finding a model that estimates the percentage of the male population that are 'only sons' at 0,1, and 2nd generation level.