# cModel.Bounds Unreliability

Revision as of 19:02, 18 August 2016 by Kate Racaza (talk | contribs)

**Member of**: SynthesisAPI.cModel

Calculates the bounds on the probability of failure at a specified time for an associated cModel object. Returns a **BoundsValues** object that represents the confidence bounds.

**Remarks**: Use the SetConfidenceLevel method to specify the confidence bound settings, and then use this method to perform the calculations. This method applies to published models only. Returns nothing if the calculation is performed on a non-published model.

## Syntax

.Bounds_Unreliability(Time,StartAge,DutyCycle)

### Parameters

*Time*

- Required. Double. The time at which to calculate the probability of failure.

*StartAge*

- Optional. Double. The start age. Default value = 0.

*DutyCycle*

- Optional. Double. The duty cycle. Default value = 1.

## Example

This example assumes that a published model with ID #47 exists in the repository.

VBA... 'Get model ID #47 from project ID #1 in the repository. Dim AModel As cModel MyRepository.Project.SetCurrentProject(1) Set AModel = MyRepository.Model.GetModel(47) 'Set the confidence level to 90% two-sided bounds. Dim ErrorMsg As String Call AModel.SetConfidenceLevel(0.9, ConfBoundsSides_TwoSidedBoth, False, ErrorMsg) 'Calculate the bounds on the model's probability of failure at time = 100. Dim ResultValue As BoundsValues Set ResultValue = AModel.Bounds_Unreliability(100) 'Output sample: Display the results for the upper and lower confidence bounds. MsgBox (" Upper bound: " & ResultValue.Upper & ", Lower bound: " & ResultValue.Lower)

VB.NET... 'Get model ID #47 from project ID #1 in the repository. Dim AModel As cModel MyRepository.Project.SetCurrentProject(1) Set AModel = MyRepository.Model.GetModel(47) 'Set the confidence level to 90% two-sided bounds. Dim ErrorMsg As String AModel.SetConfidenceLevel(0.9, ConfBoundsSides.TwoSidedBoth, False, ErrorMsg) 'Calculate the bounds on the model's probability of failure at time = 100. Dim ResultValue As BoundsValues ResultValue = AModel.Bounds_Unreliability(100) 'Output sample: Display the results for the upper and lower confidence bounds. MsgBox (" Upper bound: " & ResultValue.Upper & ", Lower bound: " & ResultValue.Lower)