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Related Concept Videos

Unusual Results01:16

Unusual Results

Unusual results are those that have a very low chance of occurring. Unusual results can be identified using probabilities and the range rule of thumb. In problems involving probability, unusual results can be observed in 2 instances – an unusually high number of successes or an unusually low number of successes.
According to the range rule of thumb, any value above or below two standard deviations, 2σ  from the mean, μ  is considered unusual.
Maximum unusual value = μ + 2σ
Minimum unusual value...
Probability in Statistics01:14

Probability in Statistics

Probability is the likelihood of an event occurring. The term event is defined as a collection of results of a procedure. An event is a simple event when an outcome cannot be divided into simpler parts.
An example of a simple event is a coin toss. The result of a coin toss is either a head or a tail. Here, head and tail are two simple events. These two simple events make up the sample space. Further, the probability of an event occurring falls within the range of 0 to 1. The probability of an...
Hazard Rate01:11

Hazard Rate

The hazard rate, also known as the hazard function or failure rate, is a statistical measure used to describe the instantaneous rate at which an event occurs, given that the event has not yet happened. From a probabilistic perspective, it represents the likelihood that a subject will experience the event in a very small time interval, conditional on surviving up to the beginning of that interval. In terms of frequency, the hazard rate can be viewed as the ratio of the number of events to the...
Poisson Probability Distribution01:09

Poisson Probability Distribution

A Poisson probability distribution is a discrete probability distribution. It gives the probability of a number of events occurring in a fixed interval of time or space if these events happen at a known average rate and independently of the time since the last event. For example, a book editor might be interested in the number of words spelled incorrectly in a particular book. It might be that, on average, there are five words spelled incorrectly in 100 pages. The interval is 100 pages.
The...
Random Error01:04

Random Error

Random or indeterminate errors originate from various uncontrollable variables, such as variations in environmental conditions, instrument imperfections, or the inherent variability of the phenomena being measured. Usually, these errors cannot be predicted, estimated, or characterized because their direction and magnitude often vary in magnitude and direction even during consecutive measurements. As a result, they are difficult to eliminate. However, the aggregate effect of these errors can be...
Censoring Survival Data01:09

Censoring Survival Data

Survival analysis is a statistical method used to analyze time-to-event data, often employed in fields such as medicine, engineering, and social sciences. One of the key challenges in survival analysis is dealing with incomplete data, a phenomenon known as "censoring." Censoring occurs when the event of interest (such as death, relapse, or system failure) has not occurred for some individuals by the end of the study period or is otherwise unobservable, and it might have many different reasons...

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Related Experiment Video

Updated: Jun 5, 2026

Rare Event Detection Using Error-corrected DNA and RNA Sequencing
10:36

Rare Event Detection Using Error-corrected DNA and RNA Sequencing

Published on: August 3, 2018

Estimating the probability of rare events: addressing zero failure data.

John Quigley1, Matthew Revie

  • 1Department of Management Science, University of Strathclyde,Glasgow G1 1QE, Scotland. j.quigley@strath.ac.uk.

Risk Analysis : an Official Publication of the Society for Risk Analysis
|January 15, 2011
PubMed
Summary

This study introduces a novel minimax inference method for estimating event probabilities, especially when no events occur. The proposed approach offers a risk-averse procedure and approximates the maximum likelihood estimate for rare events.

Related Experiment Videos

Last Updated: Jun 5, 2026

Rare Event Detection Using Error-corrected DNA and RNA Sequencing
10:36

Rare Event Detection Using Error-corrected DNA and RNA Sequencing

Published on: August 3, 2018

Area of Science:

  • Statistics
  • Probability Theory
  • Inferential Statistics

Background:

  • Traditional statistical methods yield a zero probability estimate when no events are observed.
  • Existing alternative methods for zero-event data are often ad hoc and violate statistical principles.
  • Data-dependent inference decisions complicate the assessment of estimation procedure benefits.

Purpose of the Study:

  • To propose a novel inferential procedure for estimating event probabilities, particularly for rare events or zero-event data.
  • To develop a risk-averse estimation method that adheres to fundamental statistical principles.
  • To compare the proposed method with existing approaches, including the maximum likelihood estimate (MLE).

Main Methods:

  • Utilizing minimax inference on the probability of future samples realizing no more events than observed.
  • Applying the method to situations with zero observed events, while also applicable to non-zero data.
  • Comparing the proposed estimator with the MLE and standard inference approaches for zero-event data.

Main Results:

  • The minimax procedure provides a risk-averse approach for zero-event data.
  • The method closely approximates the MLE for non-zero event data.
  • The proposed estimator for zero events can be approximated by 1/(2.5n), where n is the number of trials.

Conclusions:

  • The proposed minimax inference offers a statistically sound and risk-averse alternative for estimating event probabilities, especially with zero observed events.
  • This approach outperforms standard methods that are often unduly pessimistic in zero-event scenarios.
  • The method provides a valuable tool for inference on rare events and situations with limited data.