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Calculations with No Data Entered

Minimum Data Requirements for ALTA

Requirements for Weibull++

The following sections describe the minimum data requirements for using different folios in Weibull++.

Life Data Folios

Depending on the data type and the number of failures and/or suspensions present within your data, Weibull++ can perform all or some of the available analyses and calculations in a life data folio. Note that data sets with 2 or more distinct failure times, with or without suspensions, can be calculated with any of the available distributions, except for the mixed Weibull distribution.

For the mixed Weibull distribution, the following requirements apply:

In addition, Weibull++ allows you to work with data sets that have fewer than 2 distinct failures. However, the analysis methods that can be performed will vary depending on the data and particular case.

There are a total of five possible cases as to how data can be entered. For each scenario, a description of the available analysis options is provided:

Degradation Analysis Folios

The minimum data requirements for degradation analysis folios are as follows:

Non-Parametric Life Data Analysis (LDA) Folios

For non-parametric LDA folios, there must be at least 1 data point entered.

Warranty Analysis Folios

Weibull++ provides four data formats for warranty analysis. The requirements for each format are described next.

Nevada Chart Format

The minimum data requirements for warranty analysis folios in the Nevada chart format are as follows:

Times-to-Failure Format

The minimum data requirements for warranty analysis folios in the times-to-failure format are the same as those described previously for life data folios, except you cannot calculate with no data entered.

Dates of Failure Format

The minimum data requirements for warranty analysis folios in the dates of failure format are as follows:

Usage Format

The minimum data requirements for warranty analysis folios in the usage format are the same as those described above for warranty folios in the dates of failure format.

Event Log Folios

The minimum data requirements for event log folios are as follows:

Parametric Recurrent Event Data Analysis (RDA) Folios

The minimum data requirements for parametric recurrent RDA folios are as follows:

Non-Parametric Recurrent Event Data Analysis (RDA) Folios

The minimum data requirements for non-parametric RDA folios are as follows:

 

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