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Combined display of all available logs of ReliaWiki. You can narrow down the view by selecting a log type, the username (case-sensitive), or the affected page (also case-sensitive).

• 19:07, 7 June 2012 Lisa Hacker talk contribs deleted page New18 Introduction (content was: 'So far in this reference the life-stress relationships presented have been either single stress relationships (Chapters 6, 7, and 8) or two stress relatio…' (and the only contributor was 'Steve Sharp'))
• 19:07, 7 June 2012 Lisa Hacker talk contribs deleted page New19 Introduction (content was: 'Traditionally, accelerated tests that use a time-varying stress application have been used to assure failures quickly. This is highly desirable given the …' (and the only contributor was 'Steve Sharp'))
• 18:58, 7 June 2012 Lisa Hacker talk contribs deleted page Confidence Intervals (content was: 'Using the same methodology as in previous sections, approximate confidence intervals can be derived and applied to all results of interest using the Fishe…' (and the only contributor was 'Steve Sharp'))
• 18:57, 7 June 2012 Lisa Hacker talk contribs deleted page Example 5 (content was: 'In the previous example, it was found that the 10,000 landings life criterion for a 90% reliability was met. However, the estimate of 11,668.73 cycles (or…' (and the only contributor was 'Steve Sharp'))
• 18:57, 7 June 2012 Lisa Hacker talk contribs deleted page Example 7 (content was: 'Twenty-seven circuit boards were tested with temperature as the accelerated stress (or stimuli). The goal was to estimate the reliability after 10 years a…' (and the only contributor was 'Steve Sharp'))
• 18:57, 7 June 2012 Lisa Hacker talk contribs deleted page Example 10 (content was: 'Consider a test in which multiple stresses were applied simultaneously to a particular automotive part in order to precipitate failures more quickly than …' (and the only contributor was 'Steve Sharp'))
• 18:56, 7 June 2012 Lisa Hacker talk contribs deleted page Confidence Intervals (or Bounds) (content was: 'One of the most confusing concepts to an engineer new to the field is the concept of putting a probability on a probability. In life data analysis, this c…' (and the only contributor was 'Steve Sharp'))
• 18:56, 7 June 2012 Lisa Hacker talk contribs deleted page Conclusions (content was: 'In this appendix, two methods for estimating the parameters of accelerated life testing models were presented. First, the graphical method was illustrated…' (and the only contributor was 'Steve Sharp'))
• 18:55, 7 June 2012 Lisa Hacker talk contribs deleted page New Appendix D: References (content was: '#REDIRECT Reference Appendix D: References' (and the only contributor was 'Athanasios Gerokostopoulos'))
• 18:54, 7 June 2012 Lisa Hacker talk contribs deleted page Lifetime Distributions (Life Data Models) (content was: 'Statistical distributions have been formulated by statisticians, mathematicians and engineers to mathematically model or represent certain behavior. The p…' (and the only contributor was 'Steve Sharp'))
• 18:53, 7 June 2012 Lisa Hacker talk contribs deleted page New Introduction to Life Data Analysis (content was: '= Sections = #An Overview of Basic Concepts #Life Data #Lifetime Distributions (Life Data Models) #References' (and the only contributor was 'Steve Sharp'))
• 18:53, 7 June 2012 Lisa Hacker talk contribs deleted page The Reliability Function (content was: 'The reliability function can be derived using the previous definition of the cumulative distribution function, Eqn. (e21). The probability of an event hap…' (and the only contributor was 'Steve Sharp'))
• 18:52, 7 June 2012 Lisa Hacker talk contribs deleted page New Basic Statistical Background (content was: 'In this section provides a brief elementary introduction to the most common and fundamental statistical equations and definitions used in reliability engi…' (and the only contributor was 'Steve Sharp'))
• 18:51, 7 June 2012 Lisa Hacker talk contribs deleted page Most Commonly Used Distributions (content was: 'There are many different lifetime distributions that can be used to model reliability data. Leemis [22] and others present a good overview of many of thes…' (and the only contributor was 'Steve Sharp'))
• 18:51, 7 June 2012 Lisa Hacker talk contribs deleted page Other Distributions (content was: 'In addition to the distributions mentioned, the following additional distributions, even though not as frequently used in Life Data Analysis, have a varie…' (and the only contributor was 'Steve Sharp'))
• 18:51, 7 June 2012 Lisa Hacker talk contribs deleted page Maximum Likelihood (MLE) Parameter Estimation for Complete Data (content was: 'From a statistical point of view, the method of maximum likelihood estimation is, with some exceptions, considered to be the most robust of the parameter …' (and the only contributor was 'Steve Sharp'))
• 18:50, 7 June 2012 Lisa Hacker talk contribs deleted page Bayesian Statistics (content was: 'Up to this point, we have dealt exclusively with what is commonly referred to as classical statistics. In this section, another school of thought in stati…' (and the only contributor was 'Steve Sharp'))
• 18:49, 7 June 2012 Lisa Hacker talk contribs deleted page New Maximum Likelihood Parameter Estimation (content was: '= Sections = #Maximum Likelihood Estimation #Distribution Log-Likelihood Equations' (and the only contributor was 'Steve Sharp'))
• 16:34, 7 June 2012 Lisa Hacker talk contribs deleted page The Mathematics (content was: '#REDIRECT Median Ranks' (and the only contributor was 'Pantelis'))
• 16:34, 7 June 2012 Lisa Hacker talk contribs deleted page New Grouped Data Parameter Estimation (content was: '= Sections = #Grouped Data Analysis #When Using Rank Regression (Least Squares) #The Mathematics #When Using Maximum Likelihood' (and the only contributor was 'Steve Sharp'))
• 16:30, 7 June 2012 Lisa Hacker talk contribs deleted page Results (content was: 'The results of the first five iterations are shown in Table B.10. Using Weibull++ with rank regression on X yields: ::<math>{{\widehat{\beta }}_{RRX}}=1…' (and the only contributor was 'Steve Sharp'))
• 16:29, 7 June 2012 Lisa Hacker talk contribs deleted page Exponential Statistical Properties (content was: '====The Mean or MTTF==== The mean, <math>\overline{T},</math> or mean time to failure (MTTF) is given by: :<math>\begin{align} \bar{T}= & \int_{\gamm…' (and the only contributor was 'Steve Sharp'))
• 16:29, 7 June 2012 Lisa Hacker talk contribs deleted page Estimation of the Exponential Parameters (content was: '====Probability Plotting==== Estimation of the parameters for the exponential distribution via probability plotting is very similar to the process used wh…' (and the only contributor was 'Steve Sharp'))
• 16:25, 7 June 2012 Lisa Hacker talk contribs deleted page Newerer Confidence Bounds (content was: 'In this section, we present the methods used in the application to estimate the different types of confidence bounds for exponentially distributed data. T…' (and the only contributor was 'Steve Sharp'))
• 16:25, 7 June 2012 Lisa Hacker talk contribs deleted page Bayesian Confidence Bounds (content was: '====Bounds on Parameters==== From Chapter 5, we know that the posterior distribution of <math>\lambda </math> can be written as: ::<math>f(\lambda |Data…' (and the only contributor was 'Steve Sharp'))
• 16:24, 7 June 2012 Lisa Hacker talk contribs deleted page General Examples (content was: '=====Example 8===== Twenty units were reliability tested with the following results: {| border=1 cellspacing=0 |+ Table 7.1 - Life Test Data |- |Number…' (and the only contributor was 'Steve Sharp'))
• 16:24, 7 June 2012 Lisa Hacker talk contribs deleted page Characteristics of the Weibull Distribution (content was: 'As was mentioned previously, the Weibull distribution is widely used in reliability and life data analysis due to its versatility. Depending on the values…' (and the only contributor was 'Steve Sharp'))
• 16:24, 7 June 2012 Lisa Hacker talk contribs deleted page New Fisher Matrix Confidence Bounds (content was: 'One of the methods used by the application in estimating the different types of confidence bounds for Weibull data, the Fisher matrix method, is presented…' (and the only contributor was 'Steve Sharp'))
• 16:23, 7 June 2012 Lisa Hacker talk contribs deleted page New Bayesian Confidence Bounds (content was: '== Bounds on Parameters == Bayesian Bounds use non-informative prior distributions for both parameters. From Chapter 5, we know that if the prior distrib…' (and the only contributor was 'Steve Sharp'))
• 16:23, 7 June 2012 Lisa Hacker talk contribs deleted page Newer Fisher Matrix Confidence Bounds (content was: '===Bounds on the Parameters=== The lower and upper bounds on the mean, <math>\widehat{\mu }</math> , are estimated from: ::<math>\begin{align} & {{\m…' (and the only contributor was 'Steve Sharp'))
• 16:23, 7 June 2012 Lisa Hacker talk contribs deleted page Newer Likelihood Ratio Confidence Bounds (content was: '===Bounds on Parameters=== As covered in Chapter 5, the likelihood confidence bounds are calculated by finding values for <math>{{\theta }_{1}}</math> a…' (and the only contributor was 'Steve Sharp'))
• 16:22, 7 June 2012 Lisa Hacker talk contribs deleted page Mixed Weibull Parameter Estimation (content was: '====Regression Solution==== Weibull++ utilizes a modified Levenberg-Marquardt algorithm (non-linear regression) when performing regression analysis on a m…' (and the only contributor was 'Steve Sharp'))
• 16:22, 7 June 2012 Lisa Hacker talk contribs deleted page Generalized Gamma Probability Density Function (content was: 'The generalized gamma function is a three-parameter distribution. One version of the generalized gamma distribution uses the parameters <math>k</math>, …' (and the only contributor was 'Steve Sharp'))
• 16:22, 7 June 2012 Lisa Hacker talk contribs deleted page Generalized Gamma Reliability Function (content was: 'The reliability function for the generalized gamma distribution is given by: <math></math> ::<math>R(t)=\left\{ \begin{array}{*{35}{l}} 1-{{\Gamma }…' (and the only contributor was 'Steve Sharp'))
• 16:21, 7 June 2012 Lisa Hacker talk contribs deleted page Generalized Gamma Failure Rate Function (content was: 'As defined in Chapter 3, the failure rate function is given by: ::<math>\lambda (t)=\frac{f(t)}{R(t)}</math> Owing to the complexity of the equations i…' (and the only contributor was 'Steve Sharp'))
• 16:21, 7 June 2012 Lisa Hacker talk contribs deleted page Generalized Gamma Reliable Life (content was: 'The reliable life, <math>{{T}_{R}}</math> , of a unit for a specified reliability, starting the mission at age zero, is given by: ::<math>{{T}_{R}}=\le…' (and the only contributor was 'Steve Sharp'))
• 16:21, 7 June 2012 Lisa Hacker talk contribs deleted page Gamma Probability Density Function (content was: 'The <math>pdf</math> of the gamma distribution is given by: ::<math>f(T)=\frac{{{e}^{kz-{{e}^{z}}}}}{t\Gamma (k)}</math> where: ::<math>z=\ln (t)-\…' (and the only contributor was 'Steve Sharp'))
• 16:20, 7 June 2012 Lisa Hacker talk contribs deleted page The Gamma Mean, Median and Mode (content was: 'The gamma mean or MTTF is: ::<math>\overline{T}=k{{e}^{\mu }}</math> The mode exists if <math>k>1</math> and is given by: ::<math>\tilde{T}=(k-1){…' (and the only contributor was 'Steve Sharp'))
• 16:20, 7 June 2012 Lisa Hacker talk contribs deleted page The Gamma Standard Deviation (content was: 'The standard deviation for the gamma distribution is: ::<math>{{\sigma }_{T}}=\sqrt{k}{{e}^{\mu }}</math>' (and the only contributor was 'Steve Sharp'))
• 16:20, 7 June 2012 Lisa Hacker talk contribs deleted page Newererer Confidence Bounds (content was: 'The only method available in Weibull++ for confidence bounds for the generalized gamma distribution is the Fisher matrix, which is described next. ====Bo…' (and the only contributor was 'Steve Sharp'))
• 16:20, 7 June 2012 Lisa Hacker talk contribs deleted page The Gamma Reliable Life (content was: 'The gamma reliable life is: ::<math>{{T}_{R}}={{e}^{\mu +\ln (\Gamma _{1}^{-1}(1-R;k))}}</math>' (and the only contributor was 'Steve Sharp'))
• 16:19, 7 June 2012 Lisa Hacker talk contribs deleted page The Gamma Failure Rate Function (content was: 'The instantaneous gamma failure rate is given by: ::<math>\lambda =\frac{{{e}^{kz-{{e}^{z}}}}}{t\Gamma (k)(1-{{\Gamma }_{1}}(k;{{e}^{z}}))}</math>' (and the only contributor was 'Steve Sharp'))
• 16:19, 7 June 2012 Lisa Hacker talk contribs deleted page Bounds of the Parameters (content was: 'The lower and upper bounds on the mean, <math>\widehat{\mu }</math> , are estimated from: ::<math>\begin{align} {{\mu }_{U}}= & \widehat{\mu }+{{K}_…' (and the only contributor was 'Steve Sharp'))
• 16:19, 7 June 2012 Lisa Hacker talk contribs deleted page The Logistic Conditional Reliability Function (content was: 'The logistic conditional reliability function is given by: ::<math>R(t/T)=\frac{R(T+t)}{R(T)}=\frac{1+{{e}^{\tfrac{T-\mu }{\sigma }}}}{1+{{e}^{\tfrac{t+…' (and the only contributor was 'Steve Sharp'))
• 16:19, 7 June 2012 Lisa Hacker talk contribs deleted page Bounds on Reliability (content was: 'The reliability of the gamma distribution is: ::<math>\widehat{R}(T;\hat{\mu },\hat{k})=1-{{\Gamma }_{1}}(\widehat{k};{{e}^{\widehat{z}}})</math> where…' (and the only contributor was 'Steve Sharp'))
• 16:18, 7 June 2012 Lisa Hacker talk contribs deleted page Bounds on Time (content was: 'The bounds around time for a given gamma percentile (unreliability) are estimated by first solving the reliability equation with respect to time, as follo…' (and the only contributor was 'Steve Sharp'))
• 16:18, 7 June 2012 Lisa Hacker talk contribs deleted page The Logistic Standard Deviation (content was: 'The standard deviation of the logistic distribution, <math>{{\sigma }_{T}}</math> , is given by: ::<math>{{\sigma }_{T}}=\sigma \pi \frac{\sqrt{3}}{3…' (and the only contributor was 'Steve Sharp'))
• 16:18, 7 June 2012 Lisa Hacker talk contribs deleted page The Logistic Reliability Function (content was: 'The reliability for a mission of time <math>T</math> , starting at age 0, for the logistic distribution is determined by: ::<math>R(T)=\int_{T}^{\infty…' (and the only contributor was 'Steve Sharp'))
• 16:05, 7 June 2012 Lisa Hacker talk contribs deleted page The Logistic Failure Rate Function (content was: 'The logistic failure rate function is given by: ::<math>\lambda (T)=\frac{{{e}^{z}}}{\sigma (1+{{e}^{z}})}</math>' (and the only contributor was 'Steve Sharp'))
• 16:04, 7 June 2012 Lisa Hacker talk contribs deleted page Bounds on the Parameters (content was: 'The lower and upper bounds on the location parameter <math>\widehat{\mu }</math> are estimated from : ::<math>{{\mu }_{U}}=\widehat{\mu }+{{K}_{\alpha…' (and the only contributor was 'Steve Sharp'))