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# Sum of 2 Negative Binomial Random Variables - What is the Distribution?

If you sum 2 negative binomial random variables, do you still have a negative binomial or is it something new?

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- JoeLv 59 years agoFavorite Answer
still negative binomial

only thing that changes is NB(r, p) becomes NB(r1 + r2 , p)

Hope that helps!

Source(s): BAM! stat major!

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