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Function Wizard - Data Sources


 ReliaWiki: Confidence Bounds

Returning Confidence Bounds

For functions in Weibull++/ALTA and RGA that return confidence bounds, note that the Function Wizard for data sources only inserts one-sided bounds. If you want to show two-sided bounds, you can insert the same function twice — once at the lower confidence bound and once at the upper confidence bound. For example, for a 90% confidence level, you would set the lower confidence bound at 5% and the upper confidence bound at 95%.

=RELIABILITY(Default1,1000)returns the estimated value

=RELIABILITY(Default1,1000,,0.05)returns the lower one-sided bound at 5%

=RELIABILITY(Default1,1000,,0.95)returns the upper one-sided bound at 95%

Note that the above function expressions for the confidence bounds uses two commas (,,) to indicate that another optional input ([Add Time]) was intentionally left blank. For more information about the syntax for functions containing multiple optional inputs, see Data Entry Tips for Functions.

 

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