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Biomechanical Analysis Methods to Assess Professional Badminton Players' Lunge Performance

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Reliability of live and video-based coding in netball using the NetballStats application.

Lyndell Bruce¹, Dan Dwyer¹, Aaron Fox¹

¹Centre for Sport Research, School of Exercise and Nutrition Sciences, Deakin University, Burwood, Victoria, Australia.

|June 21, 2022

Summary

Performance analysis tool reliability is crucial for consistent netball match comparisons. Video coding offers better reliability than live coding, with higher agreement for frequent, well-defined events.

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Area of Science:

Sports Science
Performance Analysis
Netball Analytics

Background:

Reliability of performance analysis tools is vital for accurate, consistent match comparisons in sports.
Few studies have examined the reliability of commonly used performance analysis tools in netball.
Understanding coding consistency is essential for valid data interpretation.

Purpose of the Study:

To assess the inter- and intra-rater reliability of the NetballStats application.
To compare the reliability of live versus video-based coding situations for netball performance analysis.
To identify factors influencing the reliability of performance data coding.

Main Methods:

Two coders analyzed eight netball matches using the NetballStats application.
Each match was coded live and then twice from video recordings.
Agreement levels for frequency counts of coded variables were assessed.

Main Results:

Intra-rater agreement (consistency of a single coder) was higher than inter-rater agreement (consistency between coders).
Video-based coding demonstrated superior reliability compared to live coding.
High-frequency and well-defined events showed greater agreement than low-frequency or subjective events.

Conclusions:

Video coding enhances the reliability of netball performance analysis.
Live coding may underestimate event occurrences, particularly high-frequency events like 'possession'.
Comprehensive coder training and clear guidelines for subjective events are recommended to improve reliability.