Returns the inverse value of the specified beta distribution cumulative distribution function.
That is, if probability = BETADIST(x,…) BETAINV(probability,…) = x.
The beta distribution function can be used in project design to simulate the likely completion time given the desired completion time and changing parameters.
grammar
BETAINV(probability,alpha,beta,A,B)
Probability Probability of the Beta distribution.
Alpha distribution parameters.
Beta distribution parameters.
A Optional lower bound of the interval to which the value x belongs.
B Optional upper bound of the interval to which the value x belongs.
Instructions
■ If any argument is non-numeric, BETAINV returns the #VALVE! .
■ If alpha ≤ 0 or beta ≤ 0, BETAINV returns error #NUM! .
■ If probability ≤ 0 or probability > 1, BETAINV returns the #NUM! Error value .
■ If A or B values are omitted, BETAINV uses the standard cumulative beta distribution, i.e., A = 0, B = 1.
■ If A probability value is given, BETAINV solves for the value x using BETADIST(x, alpha, beta, A, B) = probability.
Therefore, the accuracy of BETAINV depends on the accuracy of BETADIST. BETAINV uses an iterative search technique.
■ If the search does not converge after 100 iterations, the function returns the #N/A error value.
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