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Description: Returns the results of the Laplace Trend goodness-of-fit test. This function is applicable to the following data types:
Times-to-failure data
Multiple Systems - Concurrent Operating Times
Multiple Systems with Dates
Multiple Systems with Event Codes
Fielded data
Repairable Systems
Fleet
Syntax: LAPLACEGOF(Data_Src, Value_Index, Signif_Level, [System_Index])
Data_Src is the source data sheet from which the value is calculated.
Value_Index is a numerical value that allows you to specify which result to display:
To show whether the system reliability is improving, deteriorating or staying the same (i.e., no trend) = 0.
To return the lower test value = 1.
To return the critical value = 2.
To return the upper test value = 3.
Signif_Level is the significance level for the results.
System_Index is an optional value that applies to multiple systems analysis. It allows you to return test results for individual systems, if enough data exists for the system. For example, to obtain the results for System 1, enter 1. If you do not enter a system ID, the function will return results for the representative system (i.e., the equivalent system, superposition system or cumulative timeline).
Remarks:
The Data_Src can be one of the following values:
If using a default data source, it must be either 1, 2, 3 or 4, as selected from the Data Source Index drop-down list.
It can take a data sheet name (e.g., "Folio1!Data 1").
It can take a variable name defined in the Defined Names window (e.g., datasource).
If the critical value falls between the lower and upper test values, then this indicates no trend. If the critical value is greater than the upper value, then this indicates a deteriorating trend. If the critical value is less than the lower test value, then this indicates an improving trend.
Example:
LAPLACEGOF (“Folio1!Data 1”,0,0.1,1) = 0.4209406668
Note that this value will vary depending on the source data set.
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