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Related Concept Videos

Longitudinal Research02:20

Longitudinal Research

Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
Longitudinal Studies01:26

Longitudinal Studies

Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...
Life Tables01:22

Life Tables

A life table is a statistical tool that summarizes the mortality and survival patterns of a population, providing detailed insights into the likelihood of survival or death across different age intervals within a cohort. By organizing data on survival probabilities and mortality rates, life tables offer a clear snapshot of population dynamics over time. They are extensively used in demography, public health, actuarial science, and ecology to analyze life expectancy, design health interventions,...
Non-LTR Retrotransposons03:18

Non-LTR Retrotransposons

As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
Wilcoxon Signed-Ranks Test for Matched Pairs01:09

Wilcoxon Signed-Ranks Test for Matched Pairs

The Wilcoxon signed-rank test for matched pairs evaluates the null hypothesis by combining the ranks of differences with their signs. It essentially tests whether the median of the differences in a population of matched pairs is zero. Since the test incorporates more information than the sign test, it generally yields more trustable conclusions. This test also does not require the data to follow a normal distribution, but two conditions must be met for it to be applicable: (1) the data must...
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...

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Another look at baseball player initials and longevity.

Gary Smith1

  • 1Department of Economics, Pomona College, 425 North College Avenue, Claremont, CA 91711, USA. gsmith@pomona.edu

Perceptual and Motor Skills
|April 7, 2011
PubMed
Summary

Major League Baseball player initials do not impact longevity. A study found no significant link between player names and lifespan, refuting earlier claims based on flawed data.

Area of Science:

  • Sports Science
  • Biostatistics
  • Sociology of Sport

Background:

  • Previous research suggested a link between Major League Baseball (MLB) player initials and longevity.
  • A 2007 study claimed players with positive initials lived 13 years longer than those with negative or neutral initials.

Purpose of the Study:

  • To re-evaluate the relationship between MLB player initials and longevity.
  • To address limitations in previous studies, including small sample size and flawed statistical methods.

Main Methods:

  • Application of a correct statistical test to independently selected initials.
  • Analysis of a larger, more representative dataset of MLB player initials and longevity.

Main Results:

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  • No statistically significant relationship was found between player initials and longevity.
  • The original findings were attributed to methodological flaws and selective data.

    • Conclusions:

    • The purported connection between MLB player initials and lifespan is unsubstantiated.
    • Correct statistical analysis indicates that initials do not influence how long players live.