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science forum beginner

Joined: 22 Jun 2006
Posts: 9

Posted: Fri Jun 30, 2006 6:18 pm    Post subject: What is this probability tree model called?

Dear all,

I am trying to find the expected depth of an unbalanced tree (I have also
posted the problem a bit earlier). My friend refers me to look for a
probability tree model that is used to model a family tree. However, all he
remembers is that the model is related to birth-death process, but not
exactly the name of the model. He said that the model has the following
characteristics:

1. There is one ancestor for the family which is the root of the tree.
2. A node in the tree can give birth to 0 to N children (i.e., a random
variable).
3. When a node has 0 offsprings, it is the leaf node of the tree.

He said that this process can be used to analyze an unbalanced tree and the
so, what is the name of it?

Regards,

Patrick

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