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Related Concept Videos

Wald-Wolfowitz Runs Test II01:17

Wald-Wolfowitz Runs Test II

The Wald-Wolfowitz runs test, commonly referred to as the runs test, is a nonparametric test used to assess the randomness of ordered data. The test evaluates the number of runs, which are consecutive sequences of similar elements within the data. If the number of runs is significantly higher or lower than expected, the data is considered non-random, indicating a detectable pattern or structure.
For binary data, runs are identified using symbols such as + and −, or equivalently, 1s and 0s. In...
Wald-Wolfowitz Runs Test I01:17

Wald-Wolfowitz Runs Test I

The Wald-Wolfowitz test, also known as the runs test, is a nonparametric statistical test used to assess the randomness of a sequence of two different types of elements (e.g., positive/negative values, successes/failures). It examines whether the order of the elements in a sequence is random or if there is a pattern or trend present. This nonparametric test applies to any ordered data despite the population and sample data distribution, even if a higher sample size is available.
The test works...
Conservation of Small Populations02:04

Conservation of Small Populations

Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less likely to...
Robbers Cave04:49

Robbers Cave

During the 1950s, the landmark Robbers Cave experiment demonstrated that when groups must compete with one another, intergroup conflict, hostility, and even violence may result. At the Oklahoman summer camp, two troops of boys—termed the Rattlers and the Eagles—took part in a week-long tournament. During this time, their negativity culminated in derogatory name-calling, fistfights, and even vandalism and destruction of property. However, this work also revealed that such tension could be...
Competition02:34

Competition

When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.
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: May 27, 2026

A Novel Pavlovian Fear Conditioning Paradigm to Study Freezing and Flight Behavior
09:26

A Novel Pavlovian Fear Conditioning Paradigm to Study Freezing and Flight Behavior

Published on: January 5, 2021

[Cry wolf].

Gudmundur Vignir Sigurdsson1, Asgeir Haraldsson, Jon R Kristinsson

  • 1Landspitala, Haskoli Islands.

Laeknabladid
|December 3, 2011
PubMed
Summary

Systemic lupus erythematosus (SLE) is rare in children but requires early suspicion due to vague initial symptoms. Prompt treatment is crucial for preventing severe complications in pediatric SLE cases.

Area of Science:

  • Pediatric Rheumatology
  • Autoimmune Diseases
  • Clinical Case Studies

Background:

  • Systemic lupus erythematosus (SLE) is an uncommon autoimmune condition affecting children and adolescents.
  • Early diagnosis and intervention are critical to prevent severe disease manifestations and long-term complications.
  • Non-specific initial symptoms often delay diagnosis, necessitating a high index of suspicion in clinical practice.

Observation:

  • A case report details a young male patient presenting with joint pain, lymphadenopathy, and fatigue.
  • The patient sought medical attention at the Children's Hospital of Iceland for these symptoms.
  • This presentation highlights the diagnostic challenges associated with pediatric SLE.

Findings:

  • The case underscores the importance of considering SLE in pediatric patients with vague, non-specific symptoms.

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Last Updated: May 27, 2026

A Novel Pavlovian Fear Conditioning Paradigm to Study Freezing and Flight Behavior
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Light/dark Transition Test for Mice
10:35

Light/dark Transition Test for Mice

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  • Review of epidemiology, diagnostic criteria, treatment, and prognosis for pediatric SLE is presented.
  • Early recognition of SLE is key to timely and effective management.

    • Implications:

    • Highlights the need for increased awareness of pediatric SLE among clinicians.
    • Emphasizes the importance of prompt diagnosis and treatment initiation to improve patient outcomes.
    • Provides a review of current knowledge on SLE in the pediatric population for clinical guidance.