For a given set of parameters, the Excel BETADIST function computes the cumulative beta probability density function.
Syntax :
=BETADIST ( x, alpha, beta, [A], [B] )
Parameters :
x – The value at which the function should be computed (must be between [A] and [B]).
alpha – A distribution parameter (must be greater than 0).
beta – A distribution parameter (must be greater than 0).
[A] -An optional parameter that specifies the lower bound of the x interval.
(If omitted, [A] is set to 0 by default.)
[B] -An optional parameter that specifies the upper bound of the x interval.
(If omitted, [B] is set to the default value of 1).
The function computes the Standard Cumulative Beta Distribution if the parameters [A] and [B] are set to 0 and 1, respectively.
Example :
The accompanying graph depicts the Standard Cumulative Beta Distribution with the parameters alpha and beta set to 4. If you wish to determine the value of this function at x = 0.4 in Excel, use the Betadist function as follows: BETADIST =BETADIST ( 0.4, 4, 5 ) This yields the value 0.4059136. It is worth noting that the parameters [A] and [B] in the preceding function call have been omitted, and therefore take on the default values 0 and 1, respectively. The Standard Cumulative Beta Distribution is shown here.
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