Negative Binomial Distribution
[Pages:71]Introduction to the Negative Binomial
Distribution
Negative Binomial Distribution in R
Relationship with
MGF, Expected Value
Geometric distribution and Variance
Relationship with other Thanks! distributions
Negative Binomial Distribution
Andre Archer, Ayoub Belemlih, Peace Madimutsa
Macalester College
November 30, 2016
1/??
Introduction to the Negative Binomial
Distribution
Negative Binomial Distribution in R
Relationship with
MGF, Expected Value
Geometric distribution and Variance
Relationship with other Thanks! distributions
Outline
1 Introduction to the Negative Binomial Distribution Defining the Negative Binomial Distribution Example 1 Example 2: The Banach Match Problem Transformation of Pdf Why so Negative? CDF of X
2 Negative Binomial Distribution in R R Code Example 3
3 Relationship with Geometric distribution 4 MGF, Expected Value and Variance
Moment Generating Function Expected Value and Variance 5 Relationship with other distributions Possion Distribution
2/??
Introduction to the Negative Binomial
Distribution
Negative Binomial Distribution in R
Relationship with
MGF, Expected Value
Geometric distribution and Variance
Relationship with other Thanks! distributions
Introduction to the Negative Binomial Distribution
Introduction to the Negative Binomial Distribution
3/??
Introduction to the Negative Binomial
Distribution
Negative Binomial Distribution in R
Relationship with
MGF, Expected Value
Geometric distribution and Variance
Defining the Negative Binomial Distribution
Relationship with other Thanks! distributions
X NB(r , p) Given a sequence of r Bernoulli trials with probability of success p, X follows a negative binomial distribution if X = k is the number of trials needed to get to the rth success.
Pdf of X P(X = k) = k - 1 pr (1 - p)k-r r -1
where X = r , r + 1, ? ? ?
4/??
Introduction to the Negative Binomial
Distribution
Negative Binomial Distribution in R
Relationship with
MGF, Expected Value
Geometric distribution and Variance
Defining the Negative Binomial Distribution
Relationship with other Thanks! distributions
Pdf of X P(X = k) = k - 1 pr (1 - p)k-r r -1
where X = r , r + 1, ? ? ?
P(X = k) = P(rth on kth trial)
5/??
Introduction to the Negative Binomial
Distribution
Negative Binomial Distribution in R
Relationship with
MGF, Expected Value
Geometric distribution and Variance
Defining the Negative Binomial Distribution
Relationship with other Thanks! distributions
Pdf of X P(X = k) = k - 1 pr (1 - p)k-r r -1
where X = r , r + 1, ? ? ?
P(X = k) = P(rth on kth trial) = P(r-1th on k-1 trials) ? P(success on kth trial)
6/??
Introduction to the Negative Binomial
Distribution
Negative Binomial Distribution in R
Relationship with
MGF, Expected Value
Geometric distribution and Variance
Defining the Negative Binomial Distribution
Relationship with other Thanks! distributions
Pdf of X P(X = k) = k - 1 pr (1 - p)k-r r -1
where X = r , r + 1, ? ? ?
P(X = k) = P(rth on kth trial) = P(r-1th on k-1 trials) ? P(success on kth trial) = k - 1 pr-1(1 - p)k-1-(r-1) ? p r -1
7/??
Introduction to the Negative Binomial
Distribution
Negative Binomial Distribution in R
Relationship with
MGF, Expected Value
Geometric distribution and Variance
Defining the Negative Binomial Distribution
Relationship with other Thanks! distributions
Pdf of X P(X = k) = k - 1 pr (1 - p)k-r r -1
where X = r , r + 1, ? ? ?
P(X = k) = P(rth on kth trial) = P(r-1th on k-1 trials) ? P(success on kth trial) = k - 1 pr-1(1 - p)k-1-(r-1) ? p r -1 = k - 1 pr-1(1 - p)k-r ? p r -1
8/??
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