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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Statistický model snížení doby do poruchy způsobeného náhodným šokem
 Volf, Petr
We consider a time-to-failure of a technical object or system and a special model of its abrupt degradation caused by a random shock. It is assumed that the consequence of such an event is the shift of 'virtual' age of the object forward, i.e. the reduction of its survival time. We present a method of statistical analysis of the case, maximum likelihood estimation and the consistency of the shift estimate under both parametric (e.g. Weibull) and non-parametrized models of time-to-failure. The examples deal with simulated as well as with the real-case.
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Survival analysis - probability distributions and their characteristics
 Plocová, Michaela ; Malá, Ivana (advisor) ; Bílková, Diana (referee)
This bachelor thesis is concerned with probability distributions that are used in survival analysis and characteristics of these distributions (survival function, hazard rate, probability density function, mean residual life). The aim of this thesis is to provide a summary of probability distributions and their characteristics, then to graphically represent them and show the shapes they can take in dependence on different parameters of distributions. The thesis is divided in 4 parts, the first three parts are mainly theoretical and they focus on general definitions of the characteristics, the most widely used distributions in survival analysis and mixture distributions. The last part is practical and focuses mainly on graphic representation of the characteristics for separate distributions and different values of parameters. Also, for each distribution measures of location and variability are calculated. The characteristics of mixture distributions are also graphically represented.
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