Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

z Scores and Area Under the Curve01:17

z Scores and Area Under the Curve

10.6K
z scores are the standardized values obtained after converting a normal distribution into a standard normal distribution. A z score is measured in units of the standard deviation. The z score tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a z score of...
10.6K
Regression Toward the Mean01:52

Regression Toward the Mean

6.3K
Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when...
6.3K
Detection of Gross Error: The Q Test01:00

Detection of Gross Error: The Q Test

6.1K
When one or more data points appear far from the rest of the data, there is a need to determine whether they are outliers and whether they should be eliminated from the data set to ensure an accurate representation of the measured value. In many cases, outliers arise from gross errors (or human errors) and do not accurately reflect the underlying phenomenon. In some cases, however, these apparent outliers reflect true phenomenological differences. In these cases, we can use statistical methods...
6.1K
Applications of Normal Distribution01:22

Applications of Normal Distribution

5.1K
The normal distribution is a useful statistical tool. One of its practical applications is determining the door height after considering the normal distribution of heights of persons, such that many can pass through it easily without striking their heads. The normal distribution can also determine the probability of a person having a height less than a specific height.
The heights of 15 to 18-year-old males from Chile from 1984 to 1985 followed a normal distribution. The mean height is 172.36...
5.1K
Weighted Mean00:57

Weighted Mean

5.2K
While taking the arithmetic, geometric, or harmonic mean of a sample data set, equal importance is assigned to all the data points. However, all the values may not always be equally important in some data sets. An intrinsic bias might make it more important to give more weightage to specific values over others.
For example, consider the number of goals scored in the matches of a tournament. While computing the average number of goals scored in the tournament, it may be more important to...
5.2K
Quantifying and Rejecting Outliers: The Grubbs Test01:02

Quantifying and Rejecting Outliers: The Grubbs Test

1.6K
Sometimes, a data set can have a recorded numerical observation that greatly  deviates from the rest of the data. Assuming that the data is normally distributed, a statistical method called the Grubbs test can be used to determine whether the observation is truly an outlier.  To perform a two-tailed Grubbs test, first, calculate the absolute difference between the outlier and the mean. Then, calculate the ratio between this difference and the standard deviation of the sample. This...
1.6K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Associations between forward center of mass velocity and pitch velocity in NCAA Division I baseball pitchers.

Journal of biomechanics·2026
Same author

Supraspinatus Tendon Thickness Is Associated With Collagen Disorganization in Symptomatic and Asymptomatic Shoulders of Individuals With Unilateral Rotator Cuff Tendinopathy.

Journal of orthopaedic research : official publication of the Orthopaedic Research Society·2026
Same author

Editorial Commentary: The Limitations of Elbow Valgus Torque as an Injury Predictor.

Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association·2026
Same author

ACTIVATE: physical activity assessment, prescription and promotion in clinical practice by healthcare professionals - a consensus study initiated by the International Federation of Sports Physical Therapy.

British journal of sports medicine·2026
Same author

Clinicians who think scapular dyskinesis is important are more likely to identify it in healthy individuals.

Shoulder & elbow·2026
Same author

Influence of Hip-Shoulder separation on pitch velocity in college baseball pitchers.

Journal of biomechanics·2025
Same journal

Selecting appropriate performance outcome measures in sports biomechanics: a procedural framework.

Sports biomechanics·2026
Same journal

Acute effects of combat boots and minimalist shoes on Achilles tendon loading during running under different load carriage magnitudes in soldiers.

Sports biomechanics·2026
Same journal

The effects of wrist height at lead foot contact on shoulder and elbow joint moments in baseball pitching.

Sports biomechanics·2026
Same journal

Lower limb muscle activity under full and partial towing assistance in sprint running.

Sports biomechanics·2026
Same journal

Assessment of movement variability and time in a football reactive agility task depending on constraints.

Sports biomechanics·2026
Same journal

The association between running velocity, cadence, and tibial acceleration in recreational runners in an outdoor environment.

Sports biomechanics·2026
查看所有相关文章

相关实验视频

Updated: Jul 5, 2025

Importance of Jumping Ability in Handball Throwing Speed and Accuracy
02:43

Importance of Jumping Ability in Handball Throwing Speed and Accuracy

Published on: April 4, 2025

368

数据规范化在棒球投球中的使用和可接受性.

Kevin A Giordano1, Adam J Barrack2, William M Murrah3

  • 1Departments of Orthopedics and Physical Therapy, Holy Cross Orthopedics Institute, Fort Lauderdale, FL, USA.

Sports biomechanics
|January 12, 2024
PubMed
概括
此摘要是机器生成的。

棒球投球中的比率正常化生物力学并不能完全解释运动员尺寸差异. 这影响了投篮速度如何预测肘部扭矩,影响了伤害风险分析.

关键词:
生物力学数据分析数据分析运动学 运动学比率变量是指比率的变量.统计 统计 统计 统计

更多相关视频

Vision Training Methods for Sports Concussion Mitigation and Management
12:54

Vision Training Methods for Sports Concussion Mitigation and Management

Published on: May 5, 2015

17.5K
Author Spotlight: Investigating the Role of Repetitive DNA Misregulation in Cancer Initiation and Immunotherapy Resistance
04:58

Author Spotlight: Investigating the Role of Repetitive DNA Misregulation in Cancer Initiation and Immunotherapy Resistance

Published on: December 13, 2024

2.4K

相关实验视频

Last Updated: Jul 5, 2025

Importance of Jumping Ability in Handball Throwing Speed and Accuracy
02:43

Importance of Jumping Ability in Handball Throwing Speed and Accuracy

Published on: April 4, 2025

368
Vision Training Methods for Sports Concussion Mitigation and Management
12:54

Vision Training Methods for Sports Concussion Mitigation and Management

Published on: May 5, 2015

17.5K
Author Spotlight: Investigating the Role of Repetitive DNA Misregulation in Cancer Initiation and Immunotherapy Resistance
04:58

Author Spotlight: Investigating the Role of Repetitive DNA Misregulation in Cancer Initiation and Immunotherapy Resistance

Published on: December 13, 2024

2.4K

科学领域:

  • 体育 生物力学 运动 生物力学
  • 棒球投球分析 棒球投球分析
  • 伤害预防 研究 研究 研究 预防伤害

背景情况:

  • 棒球投球中的动力值通常以质量或质量*高度进行正常化,以进行运动员之间的比较.
  • 规范化方法必须满足统计假设,以确保准确的数据解释.
  • 之前的研究还没有完全评估正常化对投篮生物力学中预测关系的影响.

研究的目的:

  • 为了调查肘扭矩的正常化是否会影响投球速度的预测.
  • 为了比较回归模型与没有规范的扭矩值,以评估规范化的影响.
  • 为了确定常见的规范化技术是否足够考虑中的人体测量变化.

主要方法:

  • 从1988年青年到职业棒球投手的运动捕捉数据的回顾性分析.
  • 通过比较带零截点和没有零截点的线性回归模型来测试规范化假设.
  • 检查混的人类测量变量和规范扭矩之间的剩余相关性.
  • 使用回归模型比较来评估速度对扭矩的预测效应.

主要成果:

  • 质量和质量*高度的正常化并没有消除与肘扭矩的关系.
  • 投速度预测只有10%的异常在非正常的肘部扭矩.
  • 正常化的扭矩显示出更高的方差预测:质量正常化的扭矩为59%,质量*高度正常化的扭矩为45%.
  • 正常化导致了关于速度对扭矩影响的大小的不同结论.

结论:

  • 棒球投球生物力学中的比率正常化并不能完全解释个体的人类测量差异.
  • 正常化可以改变投球速度和肘部扭矩之间的感知关系.
  • 建议对回归模型进行比较,以适当考虑投球运动数据分析中的人类学变量.