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WorksheetFunction.Weibull Method (Excel)

Returns the Weibull distribution. Use this distribution in reliability analysis, such as calculating a device's mean time to failure.


Important note Important

This function has been replaced with one or more new functions that may provide improved accuracy and whose names better reflect their usage. This function is still available for compatibility with earlier versions of Excel. However, if backward compatibility is not required, you should consider using the new functions from now on, because they more accurately describe their functionality.

For more information about the new function, see the Weibull_Dist method.

expression .Weibull(Arg1, Arg2, Arg3, Arg4)

expression A variable that represents a WorksheetFunction object.

Parameters

Name

Required/Optional

Data Type

Description

Arg1

Required

Double

X - the value at which to evaluate the function.

Arg2

Required

Double

Alpha - a parameter to the distribution.

Arg3

Required

Double

Beta - a parameter to the distribution.

Arg4

Required

Boolean

Cumulative - determines the form of the function.

Return Value

Double

  • If x, alpha, or beta is nonnumeric, WEIBULL returns the #VALUE! error value.

  • If x < 0, WEIBULL returns the #NUM! error value.

  • If alpha ≤ 0 or if beta ≤ 0, WEIBULL returns the #NUM! error value.

  • The equation for the Weibull cumulative distribution function is: Ff195375.awfweib1_ZA06051261(en-us,office.14).gif

  • The equation for the Weibull probability density function is: Ff195375.awfweib2_ZA06051262(en-us,office.14).gif

  • When alpha = 1, WEIBULL returns the exponential distribution with: Ff195375.awfweib3_ZA06051263(en-us,office.14).gif

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