Gamma Distribution Calculator

Use Gamma Distribution Calculator to find the probability density and cumulative probabilities for Gamma distribution with parameter $\alpha$ and $\beta$.

Gamma Distribution Calculator
Location Parameter $\alpha$:
Scale Parameter $\beta$
Value of x
Results
Probability density : f(x)
Probability X less than x: P(X < x)
Probability X greater than x: P(X > x)

Definition of Gamma Distribution

A continuous random variable $X$ is said to have a gamma distribution with parameter $\alpha$ and $\beta$ if its p.d.f. is given by $$f(x; \alpha,\beta) = \frac{1}{\beta^\alpha \Gamma(\alpha)} x^{\alpha-1}e^{-x/\beta}; x>0; \alpha, \beta>0$$

The parameter $\alpha$ is the scale parameter and $\beta$ is the shape parameter of gamma distribution.

Mean of Gamma Distribution

The mean or expected value of gamma random variable is

$E(X)= \dfrac{\beta}{\alpha}$

Variance of Gamma distribution

The variance of gamma random variable is

$V(X) = \dfrac{\beta}{\alpha^2}$.

Harmonic Mean of Gamma Distribution

The harmonic mean of gamma random variable is

$H=\frac{\beta-1}{\alpha}$.

Mode of Gamma distribution

The mode of gamma random variable is

$\dfrac{\beta-1}{\alpha}$.

M.G.F. of Gamma Distribution

The moment generating function of gamma random variable is

$M_X(t)=\bigg(1-\dfrac{t}{\alpha}\bigg)^{-\beta}, t<\alpha$

I hope you like Gamma distribution calculator . Click on Theory to read more about Gamma distribution,graph of gamma distribution,M.G.F and C.G.F of gamma distribution.

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