JMP 12 Online Documentation (English)
Discovering JMP
Using JMP
Basic Analysis
Essential Graphing
Profilers
Design of Experiments Guide
Fitting Linear Models
Specialized Models
Multivariate Methods
Quality and Process Methods
Reliability and Survival Methods
Consumer Research
Scripting Guide
JSL Syntax Reference
JMP iPad Help
JMP Interactive HTML
Capabilities Index
JMP 13.2 Online Documentation
Reliability and Survival Methods
•
Reliability Growth
• Reliability Growth Platform Overview
Previous
•
Next
Reliability Growth Platform Overview
The Reliability Growth platform fits Crow-AMSAA models, described in MIL-HDBK-189 (1981). A Crow-AMSAA model is a non-homogeneous Poisson process (NHPP) model with Weibull intensity; it is also known as a power law process. Such a model allows the failure intensity, which is defined by the two parameters beta and lambda, to vary over time.
The platform fits four classes of models and performs automatic change-point detection, providing reports for the following:
•
Simple Crow-AMSAA model, where both parameters are estimated using maximum likelihood.
•
Crow-AMSAA with Modified MLE, where the maximum likelihood estimate for beta is corrected for bias.
•
Fixed Parameter Crow-AMSAA model, where the user is allowed to fix either or both parameters.
•
Piecewise Weibull NHPP model, where the parameters are estimated for each test phase, taking failure history from previous phases into account.
•
Reinitialized Weibull NHPP model, where both parameters are estimated for each test phase in a manner that ignores failure history from previous phases.
•
Automatic estimation of a change-point and the associated piecewise Weibull NHPP model, for reliability growth situations where different failure intensities can define two distinct test phases.
Interactive profilers enable you to explore changes in MTBF, failure intensity, and cumulative failures over time. When you suspect a change in intensity over the testing period, you can use the change-point detection option to estimate a change-point and its corresponding model.