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Difference between revisions of "Manuals/calci/GAMMADIST"
 
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<div style="font-size:30px">'''GAMMADIST(x,alpha,beta,cu)'''</div><br/>
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<div style="font-size:30px">'''GAMMADIST(x,alpha,beta,cumulative,accuracy)'''</div><br/>
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*Where 'x' is the value of the distribution,alpha and beta are the value of the parameters and cu is the logical value like true or false.
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*<math>x</math> is the value of the distribution.
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*<math>alpha</math> and <math>beta</math> are the value of the parameters.
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*<math>cumulative</math> is the logical value like true or false.
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*<math>accuracy</math> gives accurate value of the solution.
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**GAMMADIST(), returns the gamma distribution.
  
 
==Description==
 
==Description==
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*This function gives the value of the gamma distribution.
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*This function gives the value of the Gamma Distribution.
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*The gamma distribution can be used in a queuing models like The amount of rainfall accumulated in a reservoir. *This distribution is the continuous probability distribution with two parameters α&ß.
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*The Gamma Distribution can be used in a queuing models like, the amount of rainfall accumulated in a reservoir.
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*In  GAMMADIST(x,alpha,beta,cu), x is the value of the distribution, alpha is called shape parameter and beta is the rate parameter of the distribution and cu is the logical value like TRUE or FALSE.  
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*This distribution is the Continuous Probability Distribution with two parameters <math>\alpha</math> and <math>\beta</math>.
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*If it is TRUE then this function gives the cumulative distribution value or it is FALSE then it gives the probability density function.  
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*In  <math>GAMMADIST(x,alpha,beta,cumulative,accuracy)</math>, <math>x</math> is the value of the distribution, <math>\alpha</math> is called shape parameter and <math>\beta</math> is the rate parameter of the distribution and <math>cumulative</math> is the logical value like TRUE or FALSE.
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*The gamma function is defined by Gamma(t) = integral 0 to infinity  x^{t-1} e^{-x} dx.  
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*If <math>cumulative</math> is TRUE, then this function gives the Cumulative Distribution value and if is FALSE then it gives the Probability Density Function.
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*And it is for all complex numbers except the negative integers and zero.  
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*<math>cumulative</math> gives accurate value of the solution.  
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*The probability density function of Gamma function using Shape, rate parameters is: f(x; α,ß)=[x^{α-1} e^-{x/ß}]/ß^α Gamma(α), for x,α &ß>0, where e is the natural number(e=2.71828...),  α  is the number of occurrences of an event, and Gamma(α) is the Gamma function.
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*The gamma function is defined by :
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*The standard gamma probability density function is: f(x, α)=[x^{α-1} e^-x]/Gamma(α).  
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<math>Gamma(t) = \int\limits_{0}^{\infty}x^{t-1} e^{-x} dx</math>.  
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*The  cumulative distribution function of Gamma is F(x;α,ß)=[Gamma(in symbol V)(α, x/ß)]/Gamma(α), or F(x;α,ß)= e^-{x/ß} Summation i=k to infinity 1/i! (x/ß)^i for any positive integer k.  
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*It is for all complex numbers except the negative integers and zero.  
 +
*The Probability Density Function of Gamma function using Shape, rate parameters is:
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<math> f(x; \alpha,\beta)=\frac{x^{\alpha-1} e^{-\frac {x}{\beta}}}{\beta^{\alpha} \Gamma(\alpha)}</math>, for  
 +
:<math>x, \alpha , \beta > 0 </math>, where <math>e</math> is the natural number(e = 2.71828...),  <math>\alpha</math> is the number of occurrences of an event, and <math>\Gamma(\alpha)</math> is the Gamma function.
 +
*The Standard Gamma Probability Density function is:  
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<math>f(x,\alpha)=\frac{x^{\alpha-1} e^{-x}}{\Gamma(\alpha)}</math>.  
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*The  Cumulative Distribution Function of Gamma is :
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<math>F(x;\alpha,\beta)=\frac{\gamma(\alpha,\frac{x}{\beta})}{\Gamma(\alpha)}</math>, or  
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:<math>F(x;\alpha,\beta)= e^{-\frac {x}{\beta}} \sum_{i=k}^{\infty} \frac{1}{i!} (\frac{x}{\beta})^i</math> for any positive integer <math>k</math>.  
 
*When alpha is a positive integer, then the distribution is called Erlang distribution.  
 
*When alpha is a positive integer, then the distribution is called Erlang distribution.  
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*If the shape parameter α is held fixed, the resulting one-parameter family of distributions is a natural exponential family.
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*If the shape parameter <math>\alpha</math> is held fixed, the resulting one-parameter family of distributions is a natural exponential family.
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*For a positive integer n, when alpha = n/2, beta = 2, and cu= TRUE, GAMMADIST returns (1 - CHIDIST(x)) with n degrees of freedom.  
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*For a positive integer <math>n</math>, when <math>\alpha =\frac{n}{2}</math>, <math>\beta = 2</math>, and <math>cu= TRUE</math>, GAMMADIST returns (1 - CHIDIST(x)) with <math>n</math> degrees of freedom.  
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*This function shows the result as error when 1.Any one of the argument is non numeric
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*This function shows the result as error when
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2. x<0, alpha<=0 or beta<=0
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1.Any one of the argument is non numeric
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2.<math>x<0</math>, <math>\alpha \le 0</math> or <math>\beta \le 0</math>.
 +
 
 +
==ZOS==
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*The syntax is to calculate GAMMADIST in ZOS is <math>GAMMADIST(x,alpha,beta,cumulative,accuracy)</math>.
 +
**<math>x</math> is the value of the distribution,
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**<math>alpha</math> and <math>beta</math> are the value of the parameters
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**<math>cumulative</math> is the logical value like true or false.
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**<math>accuracy</math> gives accurate value of the solution.
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*For e.g.,GAMMADIST(10.45,2.8,6.4,TRUE,0.9)
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GAMMADIST(10.45,2.8,6.4,FALSE,0.9)
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{{#ev:youtube|l_qRjj8bUdw|280|center|Gamma Distribution}}
 +
 
 
==Examples==
 
==Examples==
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#GAMMADIST(8.15372,5,7,TRUE)=0.006867292
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#GAMMADIST(20.78542,2,6,TRUE)=0.860283293
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#GAMMADIST(20.78542,2,6,FALSE)=0.01806997
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#GAMMADIST(45.6523,9,4,FALSE)=0.019724471
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#GAMMADIST(8.15372,5,7,TRUE,0.5)= 0.00693316259
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#GAMMADIST(8.15372,5,7,TRUE,0.9)=0.0067648564
 +
 +
==Related Videos==
 +
 +
{{#ev:youtube|SAMTXAAKeug|280|center|GAMMA Distribution}}
  
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#EDATE("1/1/1910",2)=Tue Mar 01 1910 00:00:00 GMT +0530 (Indian standard time)
 
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#EDATE("5/4/1897",5)=Mon Tue 04 189700:00:00 GMT +0530 (Indian standard time)
 
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#EDATE("11/31/1999",3)=Wed Mar 01 200000:00:00 GMT +0530 (Indian standard time)
 
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#EDATE("6/6/1979",-2)=Fri Apr 06 197900:00:00 GMT +0530 (Indian standard time)
 
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#EDATE("4/15/1950",-6)=Sat  Oct  15  194900:00:00 GMT +0530 (Indian standard time)
 
 
==See Also==
 
==See Also==
 
*[[Manuals/calci/DATE  | DATE ]]
 
*[[Manuals/calci/DATE  | DATE ]]
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==References==
 
==References==
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[http://en.wikipedia.org/wiki/Bessel_function| Bessel Function]
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[http://en.wikipedia.org/wiki/Gamma_distribution  Gamma Distribution]
 +
 
 +
 
 +
 
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*[[Z_API_Functions | List of Main Z Functions]]
 +
 
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*[[ Z3 |  Z3 home ]]

Latest revision as of 16:08, 7 August 2018

GAMMADIST(x,alpha,beta,cumulative,accuracy)


  • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle x} is the value of the distribution.
  • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle alpha} and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle beta} are the value of the parameters.
  • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle cumulative} is the logical value like true or false.
  • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle accuracy} gives accurate value of the solution.
    • GAMMADIST(), returns the gamma distribution.

Description

  • This function gives the value of the Gamma Distribution.
  • The Gamma Distribution can be used in a queuing models like, the amount of rainfall accumulated in a reservoir.
  • This distribution is the Continuous Probability Distribution with two parameters Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \alpha} and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \beta} .
  • In Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle GAMMADIST(x,alpha,beta,cumulative,accuracy)} , Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle x} is the value of the distribution, Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \alpha} is called shape parameter and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \beta} is the rate parameter of the distribution and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle cumulative} is the logical value like TRUE or FALSE.
  • If Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle cumulative} is TRUE, then this function gives the Cumulative Distribution value and if is FALSE then it gives the Probability Density Function.
  • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle cumulative} gives accurate value of the solution.
  • The gamma function is defined by :

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle Gamma(t) = \int\limits_{0}^{\infty}x^{t-1} e^{-x} dx} .

  • It is for all complex numbers except the negative integers and zero.
  • The Probability Density Function of Gamma function using Shape, rate parameters is:

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle f(x; \alpha,\beta)=\frac{x^{\alpha-1} e^{-\frac {x}{\beta}}}{\beta^{\alpha} \Gamma(\alpha)}} , for

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle x, \alpha , \beta > 0 } , where Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle e} is the natural number(e = 2.71828...), Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \alpha} is the number of occurrences of an event, and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \Gamma(\alpha)} is the Gamma function.
  • The Standard Gamma Probability Density function is:

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle f(x,\alpha)=\frac{x^{\alpha-1} e^{-x}}{\Gamma(\alpha)}} .

  • The Cumulative Distribution Function of Gamma is :

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle F(x;\alpha,\beta)=\frac{\gamma(\alpha,\frac{x}{\beta})}{\Gamma(\alpha)}} , or

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle F(x;\alpha,\beta)= e^{-\frac {x}{\beta}} \sum_{i=k}^{\infty} \frac{1}{i!} (\frac{x}{\beta})^i} for any positive integer  .
  • When alpha is a positive integer, then the distribution is called Erlang distribution.
  • If the shape parameter Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \alpha} is held fixed, the resulting one-parameter family of distributions is a natural exponential family.
  • For a positive integer Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle n} , when Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \alpha =\frac{n}{2}} , Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \beta = 2} , and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle cu= TRUE} , GAMMADIST returns (1 - CHIDIST(x)) with Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle n} degrees of freedom.
  • This function shows the result as error when
1.Any one of the argument is non numeric
2.Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle x<0}
, Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \alpha \le 0}
 or Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \beta \le 0}
.

ZOS

  • The syntax is to calculate GAMMADIST in ZOS is Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle GAMMADIST(x,alpha,beta,cumulative,accuracy)} .
    • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle x} is the value of the distribution,
    • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle alpha} and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle beta} are the value of the parameters
    • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle cumulative} is the logical value like true or false.
    • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle accuracy} gives accurate value of the solution.
  • For e.g.,GAMMADIST(10.45,2.8,6.4,TRUE,0.9)

GAMMADIST(10.45,2.8,6.4,FALSE,0.9)

Gamma Distribution

Examples

  1. GAMMADIST(8.15372,5,7,TRUE)=0.006867292
  2. GAMMADIST(20.78542,2,6,TRUE)=0.860283293
  3. GAMMADIST(20.78542,2,6,FALSE)=0.01806997
  4. GAMMADIST(45.6523,9,4,FALSE)=0.019724471
  5. GAMMADIST(8.15372,5,7,TRUE,0.5)= 0.00693316259
  6. GAMMADIST(8.15372,5,7,TRUE,0.9)=0.0067648564

Related Videos

GAMMA Distribution

See Also

References

Gamma Distribution


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