Stat
Dist
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Distribution
Beta
Binomial
Cauchy
Chi-squared
Erlang
Exponential
F
Gamma
Laplace
Levy
Logarithmic
Logistic
Log-logistic
Log-normal
Negative Binomial
Normal
Pareto
Poisson
Rayleigh
Student's T
Triangular
Uniform
Weibull
λ
lambda
An integer greater than or equal to 0.
Details
Parameters
Rate
λ
> 0
Support
k
∈ ℤ
PDF
λ
k
e
−
λ
k
!
CDF
γ
(⌊
k
+ 1⌋,
λ
)
⌊
k
⌋!
for
k
≥ 0
where
γ
is the lower incomplete gamma function.
Mean
λ
Enter parameter values above to view the Poisson probability mass and cumulative distribution functions
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