Documentation/How Tos/Calc: GAMMADIST function

CALC FUNCTIONS

Statistical Functions

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FUNCTIONS

Measures of Central Tendency

• Avedev
• Average
• Averagea
• Count
• Counta
• Geomean
• Hearmean
• Median
• Mode
• Trimmean

Measures of dispersion / spread

• Devsq
• Kurt
• Skew
• Stdev
• Stedeva
• Stdevp
• Stdevpa
• Var
• Vara
• Varp
• Varpa

Probability and statistics

• B
• Betadist
• Betainv
• Binomdist
• Chidist
• Chiinv
• Chisqinv
• Chitest
• Confidence
• Critbinom
• Expondist
• Finv
• Fisher
• Fisherinv
• Fdist
• Ftest
• Gamma
• Gammainv
• Gammaln
• Gammadist
• Gauss
• Hypgeomdist
• Loginv
• Lognormdist
• Negbinomdist
• Norminv
• Normdist
• Normsinv
• Normsdist
• Permut
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• Phi
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• Tdist
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• Ttest
• Weibull
• Ztest

Correlation and line fitting

• Correl
• Covar
• Forecast
• Intercept
• Pearson
• Rsq
• Slope
• Steyx

See also (in the Array Function category); GROWTH, LINEST, LOGEST, TREND

Ranking

• Large
• Max
• Maxa
• Min
• Mina
• Percentile
• Percentrank
• Quartile
• Rank
• Small

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GAMMADIST

Calculates values for a gamma distribution.

Syntax:

GAMMADIST(x; α; β; mode)

The gamma distribution is a family of continuous probability distributions, with parameters α (shape) and β (scale).

If mode is 0, GAMMADIST calculates the probability density function of the gamma distribution:

If mode is 1, GAMMADIST calculates the cumulative distribution function of the gamma distribution:

x must be greater than or equal to 0.

Example:

GAMMADIST(2; 1; 1; 1)

returns approximately 0.86.

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