# The BETA.INV function

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The frequent formulation of the beta distribution is also known as the beta distribution of the first type., while the beta distribution of the second type is an alternative name for the main beta distribution.

The BETA.INV The function returns the inverse of the cumulative probability density function beta (BETA.DIST). Be careful: there is an equivalent function called BETAINV which is slightly different (more next time).

And probability = BETA.DIST(XTRUE), subsequently BETA.INV(probability, …) = X. The beta distribution can be used in project planning to model probable completion times given an expected completion time and variability.

The BETA.INV The function uses the following syntax to operate:

BETA.INV (probability, alfa, beta,[A],[B])

The BETA.INV The function has the following arguments:

• probability: required. This represents a probability associated with beta distribution
• alfa: additionally required. This is a parameter of the distribution
• beta: required. This is also a parameter of the distribution
• A: Optional. This is a lower limit for the interval of X
• B: this is also optional. This is an upper limit for the interval of X.

It should be noted at the same time that:

• If any argument is not numeric, BETA.INV return the #VALUE! error value
• And alfa ≤ 0 O beta ≤ 0, BETA.INV return the #ON ONE! error value
• And probability ≤ 0 O probability > 1, BETA.INV return the #ON ONE! error value
• If you omit values ​​for A Y B, BETA.INV uses the standard cumulative beta distribution, so that A = 0 Y B = 1
• This function first appeared in Excel 2010 and is not backward compatible. It is essentially a more flexible version of its predecessor, BETAINV.

Given a probability value, BETA.INV look for that value X such that BETA.DIST (x, alpha, beta, TRUE, A, B) = probability. Therefore, the precision of BETA.INV depends on the precision of BETA.DIST.

Here is an example: