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WorksheetFunction.Weibull_Dist Method (Excel)

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

Version Added: Excel 2010

expression .Weibull_Dist(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 non-numeric, WEIBULL_DIST returns the #VALUE! error value.

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

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

  • The equation for the Weibull cumulative distribution function is: Ff194450.awfweib1_ZA06051261(en-us,office.14).gif

  • The equation for the Weibull probability density function is: Ff194450.awfweib2_ZA06051262(en-us,office.14).gif

  • When alpha = 1, WEIBULL_DIST returns the exponential distribution with: Ff194450.awfweib3_ZA06051263(en-us,office.14).gif

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