Distributions in R

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4. The definition of geometric distribution in R is not the same as the common definition. A random variable of geometric distribution in R starts from zero, i.e. geometric distribution in R is defined as the number of failures before we succeed.

5. A random variable of negative binomial distribution $NB(r,p)$ in R is defined as the number of failures before we succeed for r times, where p is the success probability in each trial.

6. The definition of hyper-geometric is the same as common but be careful with the parameters!