Loading

Error: Cannot Load Popup Box

Hit List

Title:

Learning from multinomial data: a nonparametric predictive alternative to the Imprecise Dirichlet Model

Description:

A new model for learning from multinomial data has recently been developed, giving predictive inferences in the form of lower and upper probabilities for a future observation. Apart from the past observations, no information on the sample space is assumed, so explicitly no assumptions are made on the number of possible categories. In this paper,...

A new model for learning from multinomial data has recently been developed, giving predictive inferences in the form of lower and upper probabilities for a future observation. Apart from the past observations, no information on the sample space is assumed, so explicitly no assumptions are made on the number of possible categories. In this paper, we briefly present the general lower and upper probabilities corresponding to this model, and illustrate their properties via two examples taken from Walley’s paper [16], which introduced the imprecise Dirichlet model (IDM). As our approach is nonparametric, its applicability is more restricted. However, our inferences do not suffer from some disadvantages of the IDM. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2008-07-17

Source:

http://maths.dur.ac.uk/stats/people/fc/npi/Coolen-Augustin.pdf

http://maths.dur.ac.uk/stats/people/fc/npi/Coolen-Augustin.pdf Minimize

Document Type:

text

Language:

en

Subjects:

data

data Minimize

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

URL:

Content Provider:

My Lists:

My Tags:

Notes:

Title:

Parametric probability distributions in reliability ∗

Description:

In this paper, we present an overview of basic parametric probability distributions which are frequently used in reliability. We present some main characteristics of these distributions, and briefly discuss underlying assumptions related to their suitability as models for specific reliability scenarios.

In this paper, we present an overview of basic parametric probability distributions which are frequently used in reliability. We present some main characteristics of these distributions, and briefly discuss underlying assumptions related to their suitability as models for specific reliability scenarios. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2009-08-06

Source:

http://maths.dur.ac.uk/stats/people/fc/pmdist.pdf

http://maths.dur.ac.uk/stats/people/fc/pmdist.pdf Minimize

Document Type:

text

Language:

en

Subjects:

Binomial distribution ; Exponential distribution ; Gamma distribution ; Normal distribution ; Poisson distribution ; Weibull distribution

Binomial distribution ; Exponential distribution ; Gamma distribution ; Normal distribution ; Poisson distribution ; Weibull distribution Minimize

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

URL:

Content Provider:

My Lists:

My Tags:

Notes:

Title:

Jury size and composition -- a predictive approach

Description:

We consider two basic aspects of juries that must decide on guilt verdicts, namely the size of juries and their composition in situations where society consists of sub-populations. We refer to the actual jury that needs to provide a verdict as the ‘first jury’, and as their judgement should reflect that of society, we consider an imaginary ‘seco...

We consider two basic aspects of juries that must decide on guilt verdicts, namely the size of juries and their composition in situations where society consists of sub-populations. We refer to the actual jury that needs to provide a verdict as the ‘first jury’, and as their judgement should reflect that of society, we consider an imaginary ‘second jury’ to represent society. The focus is mostly on a lower probability of a guilty verdict by the second jury, conditional on a guilty verdict by the first jury, under suitable exchangeability assumptions between this second jury and the first jury. Using a lower probability of a guilty verdict naturally provides a ‘benefit of doubt to the defendant’ robustness of the inference. By use of a predictive approach, no assumptions on the guilt of a defendant are required, which distinguishes this approach from those presented before. The statistical inferences used in this paper are relatively straightforward, as only cases are considered where the lower probabilities according to Coolen’s Nonparametric Predictive Inference for Bernoulli random quantities [5] and Walley’s Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2010-10-13

Source:

http://www.dur.ac.uk/brett.houlding/resources/isipta07-juries.pdf

http://www.dur.ac.uk/brett.houlding/resources/isipta07-juries.pdf Minimize

Document Type:

text

Language:

en

Subjects:

lower probability ; Nonparametric Predictive Inference ; representation of sub-populations

lower probability ; Nonparametric Predictive Inference ; representation of sub-populations Minimize

DDC:

160 Logic *(computed)*

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

URL:

Content Provider:

My Lists:

My Tags:

Notes:

Title:

On Nonparametric Predictive Inference and Objective Bayesianism

Description:

This paper consists of three main parts. First, we give an introduction to Hill’s assumption A(n) and to theory of interval probability, and an overview of recently developed theory and methods for nonparametric predictive inference (NPI), which is based on A(n) and uses interval probability to quantify uncertainty. Thereafter, we illustrate NPI...

This paper consists of three main parts. First, we give an introduction to Hill’s assumption A(n) and to theory of interval probability, and an overview of recently developed theory and methods for nonparametric predictive inference (NPI), which is based on A(n) and uses interval probability to quantify uncertainty. Thereafter, we illustrate NPI by introducing a variation to the assumption A(n), suitable for inference based on circular data, with applications to several data sets from the literature. This includes attention to comparison of two groups of circular data, and to grouped data. We briefly discuss such inference for multiple future observations. We end the paper with a discussion of NPI and objective Bayesianism. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2014-06-27

Source:

http://maths.dur.ac.uk/stats/people/fc/npi/coolen-jlli.pdf

http://maths.dur.ac.uk/stats/people/fc/npi/coolen-jlli.pdf Minimize

Document Type:

text

Language:

en

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

URL:

Content Provider:

My Lists:

My Tags:

Notes:

Title:

On nonparametric predictive inference and objective Bayesianism

Description:

This paper consists of three main parts. First, we give an introduction to Hill’s assumption A (n) and to theory of interval probability, and an overview of recently developed theory and methods for nonparametric predictive inference (NPI), which is based on A (n) and uses interval probability to quantify uncertainty. Thereafter, we illustrate N...

This paper consists of three main parts. First, we give an introduction to Hill’s assumption A (n) and to theory of interval probability, and an overview of recently developed theory and methods for nonparametric predictive inference (NPI), which is based on A (n) and uses interval probability to quantify uncertainty. Thereafter, we illustrate NPI by introducing a variation to the assumption A (n), suitable for inference based on circular data, with applications to several data sets from the literature. This includes attention to comparison of two groups of circular data, and to grouped data. We briefly discuss such inference for multiple future observations. We end the paper with a discussion of NPI and objective Bayesianism. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2008-07-17

Source:

http://www.kent.ac.uk/secl/philosophy/jw/2005/progic/papers/Coolen.pdf

http://www.kent.ac.uk/secl/philosophy/jw/2005/progic/papers/Coolen.pdf Minimize

Document Type:

text

Language:

en

Subjects:

A (n ; circular data ; exchangeability ; grouped data ; imprecise probabilities

A (n ; circular data ; exchangeability ; grouped data ; imprecise probabilities Minimize

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

URL:

Content Provider:

My Lists:

My Tags:

Notes:

Title:

Nonparametric adaptive opportunity-based age replacement strategies

Author:

Description:

We consider opportunity-based age replacement using nonparametric predictive inference (NPI) for the time to failure of a future unit. Based on n observed failure times, NPI provides lower and upper bounds for the survival function for the time to failure Xn+1 of a future unit, which lead to upper and lower cost functions, respectively, for oppo...

We consider opportunity-based age replacement using nonparametric predictive inference (NPI) for the time to failure of a future unit. Based on n observed failure times, NPI provides lower and upper bounds for the survival function for the time to failure Xn+1 of a future unit, which lead to upper and lower cost functions, respectively, for opportunitybased age replacement based on the renewal reward theorem. Optimal opportunity-based age replacement strategies for unit n+1 follow by minimising these cost functions. Following this strategy, unit n + 1 is correctively replaced upon failure, or preventively replaced upon the first opportunity after the optimal opportunity-based age replacement threshold. We study the effect of this replacement information for unit n + 1 on the optimal opportunitybased age replacement strategy for unit n + 2. We illustrate our method with examples and a simulation study. Our method is fully adaptive to available data, providing an alternative to the classical approach where the probability distribution of a unit’s time to failure is assumed to be known. We discuss the possible use of our method and compare it with the classical approach, where we conclude that in most situations our adaptive method performs very well, but that counter-intuitive results can occur. Keywords: Opportunity-based age replacement; Nonparametric predictive inference; Renewal reward theorem. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2009-08-06

Source:

http://maths.dur.ac.uk/stats/people/ps/opport3.pdf

http://maths.dur.ac.uk/stats/people/ps/opport3.pdf Minimize

Document Type:

text

Language:

en

DDC:

519 Probabilities & applied mathematics *(computed)*

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

URL:

Content Provider:

My Lists:

My Tags:

Notes:

Title:

Nonparametric predictive comparison of proportions

Author:

Description:

We use the lower and upper predictive probabilities from Coolen [5] to compare future numbers of successes in Bernoulli trials for different groups. We consider both pairwise and multiple comparisons. These inferences are in terms of lower and upper probabilities that the number of successes in m future trials from one group exceeds the number o...

We use the lower and upper predictive probabilities from Coolen [5] to compare future numbers of successes in Bernoulli trials for different groups. We consider both pairwise and multiple comparisons. These inferences are in terms of lower and upper probabilities that the number of successes in m future trials from one group exceeds the number of successes in m future trials from another group, or such numbers from all other groups. We analyse these lower and upper probabilities via application to two data sets from the literature, and discuss the imprecision in relation to m. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2008-07-16

Source:

http://maths.dur.ac.uk/stats/people/fc/npi/props-rev.pdf

http://maths.dur.ac.uk/stats/people/fc/npi/props-rev.pdf Minimize

Document Type:

text

Language:

en

Subjects:

Key Words ; Bernoulli trials ; Lower and upper probabilities ; Multiple comparisons ; Nonparametric predictive inference

Key Words ; Bernoulli trials ; Lower and upper probabilities ; Multiple comparisons ; Nonparametric predictive inference Minimize

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

URL:

Content Provider:

My Lists:

My Tags:

Notes:

Title:

Nonparametric predictive inference for voting systems

Author:

Description:

We present upper and lower probabilities for reliability of voting systems, also known as k-outof-m systems, which include series- and parallel-systems. We restrict attention to systems with identical components. These interval probabilities are based on the nonparametric predictive inferential (NPI) approach for Bernoulli data presented by Cool...

We present upper and lower probabilities for reliability of voting systems, also known as k-outof-m systems, which include series- and parallel-systems. We restrict attention to systems with identical components. These interval probabilities are based on the nonparametric predictive inferential (NPI) approach for Bernoulli data presented by Coolen (1998). In this approach, it is assumed that test data are available on the components, and that the future components to be used in the system are exchangeable with these. This approach fits into the general framework of Imprecise Reliability, which has received increasing attention in recent years (Utkin and Coolen 2007). An early overview of NPI in Reliability was presented by Coolen, Coolen-Schrijner and Yan (2002), in recent years NPI has been further developed and presented as an attractive statistical theory for situations where one aims at inference for future observables on the basis of available data, adding only rather limited additional assumptions (Coolen 2006a). A particularly attractive feature of NPI in Reliability, with lower and upper probabilities, is that data containing zero failures can be dealt with in an attractive manner, which will also be illustrated in this paper for reliability of voting systems. 1 Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2009-08-06

Source:

http://maths.dur.ac.uk/stats/people/fc/mmr07-voting.pdf

http://maths.dur.ac.uk/stats/people/fc/mmr07-voting.pdf Minimize

Document Type:

text

Language:

en

DDC:

310 Collections of general statistics *(computed)*

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

URL:

Content Provider:

My Lists:

My Tags:

Notes:

Title:

Non-parametric predictive inference for age replacement with a renewal argument. Quality and Reliablity Engineering

Author:

Description:

We consider an age replacement problem with cost function based on the renewal reward theorem. However, instead of assuming a known probability distribution for the lifetimes, we apply Hill’s assumption A (n) for predicting probabilities for the lifetime of a future item. Lower and upper bounds for the survival function of a future item are used...

We consider an age replacement problem with cost function based on the renewal reward theorem. However, instead of assuming a known probability distribution for the lifetimes, we apply Hill’s assumption A (n) for predicting probabilities for the lifetime of a future item. Lower and upper bounds for the survival function of a future item are used, resulting in upper and lower cost functions. Minimising these upper and lower cost functions to obtain the optimal age replacement times is simplified due to the special form of these functions. To discuss some features of our approach, we first study the consequences of using n equally spaced percentiles from a known distribution instead of n observed data. Secondly, we report on a simulation study where the lifetimes are simulated from known distributions, so that the optimal replacement times corresponding to our approach can be compared with the theoretical optimal replacement times. 1 Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2009-08-06

Source:

http://maths.dur.ac.uk/stats/people/ps/arts2.pdf

http://maths.dur.ac.uk/stats/people/ps/arts2.pdf Minimize

Document Type:

text

Language:

en

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

URL:

Content Provider:

My Lists:

My Tags:

Notes:

Title:

Nonparametric adaptive age replacement with a one-cycle criterion

Author:

Description:

Age replacement of technical units has received much attention in the reliability literature over the last four decades. Mostly, the failure time distribution for the units is assumed to be known, and minimal costs per unit of time is used as optimality criterion, where renewal reward theory simplifies the mathematics involved but requires the a...

Age replacement of technical units has received much attention in the reliability literature over the last four decades. Mostly, the failure time distribution for the units is assumed to be known, and minimal costs per unit of time is used as optimality criterion, where renewal reward theory simplifies the mathematics involved but requires the assumption that the same process and replacement strategy continues over a very large (‘infinite’) period of time. Recently, there has been increasing attention to adaptive strategies for age replacement, taking into account the information from the process. Although renewal reward theory can still be used to provide an intuitively and mathematically attractive optimality criterion, it is more logical to use minimal costs per unit of time over a single cycle as optimality criterion for adaptive age replacement. In this paper, we first show that in the classical age replacement setting, with known failure time distribution with increasing hazard rate, the one-cycle criterion leads to earlier replacement than the renewal reward criterion. Thereafter, we present adaptive age replacement with a one-cycle criterion within the nonparametric predictive inferential framework. We study the performance of this approach via simulations, which are also used for comparisons with the use of the renewal reward criterion within the same statistical framework. Key words: Age replacement; nonparametric predictive inference; one-cycle optimality criterion; renewal reward theorem. 1 1 Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2009-08-06

Source:

http://maths.dur.ac.uk/stats/people/ps/ress1cyc.pdf

http://maths.dur.ac.uk/stats/people/ps/ress1cyc.pdf Minimize

Document Type:

text

Language:

en

DDC:

519 Probabilities & applied mathematics *(computed)*

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

URL:

Content Provider:

My Lists:

My Tags:

Notes:

Currently in BASE: 69,426,436 Documents of 3,331 Content Sources

http://www.base-search.net