Reliability and Survival Methods • Reliability Forecast • Launch the Reliability Forecast Platform
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Launch the Reliability Forecast Platform
Launch the Reliability Forecast platform by selecting Analyze > Reliability and Survival > Reliability Forecast. The initial window is shown in Reliability Forecast Launch Window.
Reliability Forecast Launch Window
The launch window includes a tab for each contract data format: Nevada, Dates, and Time to Failure (or Time to Event). The following sections describe these formats.
Nevada Format
Contract data is commonly stored in the Nevada format: shipment or production dates and failure counts within specified periods are shaped like the state of Nevada. Example of the Nevada Format shows the Small Production.jmp sample data table.
Example of the Nevada Format
The Nevada Format tab contains the following options:
Interval Censored Failure
Considers the returned quantity to be interval censored. The interval is between the last recorded time and the time that the failure was observed. Selected by default.
Life Time Unit
The physical date-time format of all time stamps, including column titles for return counts. The platform uses this setting in forecasting step increments.
Production Count
The number of units produced
Timestamp
The production date
Failure Count
The number of failed units
Group ID
The variable by which observations are grouped. Each group has its own distribution fit and forecast. A combined forecast is also included.
Dates Format
The Dates format focuses on production and failure dates. One data table specifies the production counts for each time period. The other table provides failure dates, failure counts, and the corresponding production times of the failures.
Example of the Dates Format shows the SmallProduction part1.jmp and SmallProduction part2.jmp sample data tables.
Example of the Dates Format
The Dates Format tab is divided into Production Data and Failure Data sections.
Production Data
Select Table
the table that contains the number of units and the production dates
Failure Data
Select Table
The table that contains failure data, such as the number of failed units, production dates, and failure dates
Left Censor
The column that identifies censored observations
Timestamp
The column that links production observations to failure observations, indicating which batch a failed unit came from.
Censor Code
The code for censored observations. Only available when you assign a Censor variable.
For more information about censored data, see Event Plot in Life Distribution.
Other options are identical to those on the Nevada Format tab. See Nevada Format for details.
Time to Event Format
The Time to Event format shows production and failure data (Example of the Time to Event Format). Unlike the Nevada and Dates formats, Time to Event data does not include date-time information, such as production or failure dates. This format accommodates arbitrary censoring schemes in the data.
To obtain a data set convenient for Time to Event Format, open SmallProduction.jmp, found in the Reliability subfolder. Run the data table script Nevada Format. From the Reliability Forecast report’s red triangle menu, select Save Data in Time to Event Format.
Example of the Time to Event Format
The Time to Event Format tab contains the following options:
Forecast Start Time
When the forecast begins. Enter the first value that you want on the horizontal axis.
Censor Code
The code for censored observations. Only available when you assign a Censor variable.
Other options are identical to those on the Nevada Format tab. See Nevada Format for details.