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NCSS
Reliability Analysis
Introduction
The reliability procedure estimates the parameters of the
exponential, extreme value, logistic, log-logistic, lognormal, normal,
and Weibull probability distributions by maximum likelihood and least
squares. It can fit complete, right censored, left censored, interval
censored (readout), and grouped data values. It also computes the
nonparametric Kaplan-Meier and Nelson-Aalen estimates of reliability and
associated hazard rates.
Another module fits the regression relationship between time-to-failure
and one or more independent variables. The distribution of the residuals
(errors) can follow the exponential, extreme value, logistic,
log-logistic, lognormal, lognormal10, normal, or Weibull distributions.
The data may include failed, left censored, right censored, and interval
observations. This type of data often arises in the area of accelerated
life testing.
Features
> Accelerated life
testing
> Arrhenius transformation
> Beta distribution
> Censoring – all types
> Competing risks
> Confidence limits
> Cox-Snell residuals
> Cumulative Incidence
> Distribution selection
> Exponential distribution
> Exponential regression
> Extreme-value distribution
> Extreme-value regression
> Failure time percentiles
> Gamma distribution
> Goodness of fit
> Hazard rate plots
> Hazard functions & plots
> Information matrix |
>
Kaplan-Meier product limit
> Least squares estimates
> Life-table analysis
> Log-logistic distribution
> Log-logistic regression
> Lognormal distribution
> Lognormal regression
> Maximum likelihood
> Poisson regression
> Probit analysis
> Probability plots
> Reliability statistics
> Residual analysis
> Residual life report
> Stress variables
> Stress plots
> Threshold estimate
> Weibull distribution
> Weibull regression |
[Back to NCSS]
[Back to NCSS
Procedure List]
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System Requirements
Runs under Windows Vista, XP, 2000, NT, ME, 98, 95 compatible Pentium-class computers with at least 32 MB of RAM. Requires 200 MB of hard disk space. Requires Adobe Reader® version 7 or later to use the NCSS, PASS, and GESS Help Systems. |
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Accuracy
We at NCSS have put a
great deal of effort into finding the most
accurate algorithms possible. The programs have
been tested and verified over and over, both by
us and by our customers. Each routine has been
verified against textbooks, journal articles,
and, where possible, other software. NCSS is one
of the most accurate statistical analysis
programs available. NCSS calculates with
seventeen-digit, double-precision accuracy. |
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Guarantee
If you are not completely
satisfied with an NCSS product during the first
30 days for any reason, return the program for a
full, prompt refund (excluding shipping)--no
questions asked. |
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