Statistics for Maintenance Modelling: Continuous Lifetime Distributions 1

# Calculating the Weibull Distribution Using Excel¤

The Excel function:

WEIBULL(x,alpha,beta,cumulative)

calculates the Weibull probabilities. The parameters of this Excel function are:

- x corresponds to t in our notation
- alpha corresponds to in our notation
- beta corresponds to in our notation
- cumulative is false if it's the probability density function that you require and true if it's the cumulative distribution function that you want instead.

Hence the value for t = 1.5 in our chart of the probability density function with our alpha = 2 and beta = 2 is given by:

- Weibull(1.5, 2, 2, false) = 0.427337

The corresponding reliability function value is given by:

- 1 - Weibull(1.5, 2, 2, true) = 0.569783

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