About Probability Distribution Report

The baseline GE Digital APM database includes the Probability Distribution report, which you can use to view a summary of the results of a Probability Distribution Analysis.

The Probability Distribution report is built from the following Catalog items:

The subreport, SubReportProbDist, which is stored in the Catalog folder \\Public\Meridium\Modules\Reliability Manager\Reports.
The supporting queries that supply data in the main report and subreport, which are stored in the Catalog folder \\Public\Meridium\Modules\Reliability Manager\Reports. The following supporting queries are available:
- ProbabilityDistributionQuery
- Weibull Distribution Query
- Lognormal Distribution Query
- Normal Distribution Query
- Exponential Distribution Query

Throughout this documentation, we refer to the main report, the subreport, and the supporting queries collectively as the Probability Distribution report.

The Probability Distribution report contains a prompt on the ENTY KEY and Distribution Type fields in the Distribution family. When you run the Probability Distribution report via the Probability Distribution module, the ENTY KEY and Distribution Type of the Distribution record associated with the current analysis is passed automatically to the prompt, and the results for the current Probability Distribution Analysis are displayed. If you run the main report or any of the queries in the preceding list directly from the Catalog, however, you will need to supply the ENTY KEY and Distribution Type of a Distribution record manually to retrieve results. The subreport (i.e., Catalog item SubReportProbDist) cannot be run directly from the Catalog.

Analysis Summary Section

The Analysis Summary section of the Probability Distribution report displays information that is stored in a Distribution record. Distribution records are categorized into one of four Distribution subfamilies: Exponential, Lognormal, Normal, or Weibull.

The following table lists each item in the Analysis Summary section and the corresponding Distribution record field whose data is displayed in the report.

Report Item	Distribution record
Analysis Name	Analysis ID
Analysis Description	Short Description
Random Variable	Random Variable Field
Units	Units
Last Modified	LAST UPDT DT
Modified By	LAST UPBY SEUS KEY Note: The name of the Security User associated with this value is displayed in the report.

Statistical Distribution Information Section

The Statistical Distribution Information section of the Probability Distribution report displays information that is stored in the Distribution record (i.e., Exponential, Lognormal, Normal, or Weibull record).

The following subsections are displayed within the Statistical Distribution Information section:

Distribution

The Distribution Type subsection displays information that is stored in the Distribution record. Throughout the documentation, we will refer to this subsection as the Distribution subsection.

The following table lists each item in the Distribution subsection and the corresponding Distribution record field whose data is displayed in the report.

Report Item	Distribution Field
Distribution Type	Distribution Type
Fit Method	Fit Method
Use Confidence	Use Confidence
Confidence Level	Confidence Level
Mean	Mean
Standard Deviation	Standard Deviation
Median	Median
R2	R-Squared

Parameters

The Parameters subsection contains information stored in the Distribution record. The type of information that appears in the Parameters subsection depends on the distribution type (i.e., Weibull, Lognormal, Exponential, or Normal).

The following table lists each item in the Parameters subsection for a Weibull record whose data is displayed in the report. One row is displayed for each of the following field captions: Beta, Eta, and Gamma.

Report Item	Weibull Field
Beta
Value	Beta
Low	Beta Low
High	Beta High
Calculated	Beta Fixed
Eta
Value	Eta
Low	Eta Low
High	Eta High
Calculated	Eta Fixed
Gamma
Value	Gamma
Low	Gamma Low
High	Gamma High
Calculated	Gamma Fixed

The following table lists each item in the Parameters subsection for a Lognormal record whose data is displayed in the report. For a Lognormal record, one row is displayed for each of the following field captions: Mu, Sigma, and Gamma.

Report Item	Lognormal Field
Mu
Value	Mu
Low	Mu Low
High	Mu High
Calculated	Mu Fixed
Sigma
Value	Sigma
Low	Sigma Low
High	Sigma High
Calculated	Sigma Fixed
Gamma
Value	Gamma
Low	Gamma Low
High	Gamma High
Calculated	Gamma Fixed

The following table lists each item in the Parameters subsection for an Exponential record whose data is displayed in the report. For an Exponential record, one row is displayed for the field caption MTBF.

Report Item	Exponential Field
MTBF
Value	MTBF
Low	MTBF Low
High	MTBF High
Calculated	MTBF Fixed

The following table lists each item in the Parameters subsection for a Normal record whose data is displayed in the report. For a Normal record, one row is displayed for each of the following field captions: Mean, Standard Deviation.

Report Item	Normal Field
Mean
Value	Mean
Low	Mean Low
High	Mean High
Calculated	Mean Fixed
Standard Deviation
Value	Standard Deviation
Low	Standard Deviation Low
High	Standard Deviation High
Calculated	Standard Deviation Fixed

Goodness of Fit Test

The Goodness of Fit Test subsection displays information from the Distribution record.

The Kolmogorov-Smirnov test is the only test used to measure goodness of fit, so the Name column in the report is populated with the value Kolmogorov-Smirnov Test.

The following table lists each remaining item in the Goodness of Fit Test subsection and the Distribution record field whose data is displayed in the report.

Report Item	Weibull Field
Statistic	GOF Statistic
P-Value	GOF P-Value
Passed	Passed