# Gamma Distribution

Fit, evaluate, and generate random samples from gamma distribution

Statistics and Machine Learning Toolbox™ offers several ways to work with the gamma distribution.

• Create a probability distribution object `GammaDistribution` by fitting a probability distribution to sample data or by specifying parameter values. Then, use object functions to evaluate the distribution, generate random numbers, and so on.

• Work with the gamma distribution interactively by using the Distribution Fitter app. You can export an object from the app and use the object functions.

• Use distribution-specific functions with specified distribution parameters. The distribution-specific functions can accept parameters of multiple gamma distributions.

• Use generic distribution functions (`cdf`, `icdf`, `pdf`, `random`) with a specified distribution name (`'Gamma'`) and parameters.

To learn about the gamma distribution, see Gamma Distribution.

## Objects

 `GammaDistribution` Gamma probability distribution object

## Apps

 Distribution Fitter Fit probability distributions to data Probability Distribution Function Interactive density and distribution plots

## Functions

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#### Create `GammaDistribution` Object

 `makedist` Create probability distribution object `fitdist` Fit probability distribution object to data

#### Work with `GammaDistribution` Object

 `cdf` Cumulative distribution function `gather` Gather properties of Statistics and Machine Learning Toolbox object from GPU (Since R2020b) `icdf` Inverse cumulative distribution function `iqr` Interquartile range of probability distribution `mean` Mean of probability distribution `median` Median of probability distribution `negloglik` Negative loglikelihood of probability distribution `paramci` Confidence intervals for probability distribution parameters `pdf` Probability density function `plot` Plot probability distribution object (Since R2022b) `proflik` Profile likelihood function for probability distribution `random` Random numbers `std` Standard deviation of probability distribution `truncate` Truncate probability distribution object `var` Variance of probability distribution
 `gamcdf` Gamma cumulative distribution function `gampdf` Gamma probability density function `gaminv` Gamma inverse cumulative distribution function `gamlike` Gamma negative log-likelihood `gamstat` Gamma mean and variance `gamfit` Gamma parameter estimates `gamrnd` Gamma random numbers `randg` Gamma random numbers with unit scale
 `mle` Maximum likelihood estimates `mlecov` Asymptotic covariance of maximum likelihood estimators
 `distributionFitter` Open Distribution Fitter app `histfit` Histogram with a distribution fit `plot` Plot probability distribution object (Since R2022b) `qqplot` Quantile-quantile plot `randtool` Interactive random number generation

## Topics

• Gamma Distribution

The gamma distribution models sums of exponentially distributed random variables.