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The t-test is a statistical method used to compare the sample mean with a population mean or compare two means from two data sets. The test statistic is calculated from the standard deviation, mean, and number of measurements in the data set at a selected confidence interval and then compared to a table of critical values at this confidence level. If the test statistic is smaller than the critical value, the null hypothesis is accepted. In this case, we state that the difference between the...
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Updated: May 27, 2026

Isokinetic Robotic Device to Improve Test-Retest and Inter-Rater Reliability for Stretch Reflex Measurements in Stroke Patients with Spasticity
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Test-retest reliability for hitting accuracy tennis test.

Estevam Strecker1, Ernest B Foster, David D Pascoe

  • 1Auburn University Thermal Lab, Auburn, Alabama, USA. estevam.strecker@austintennisacademy.com

Journal of Strength and Conditioning Research
|November 15, 2011
PubMed
Summary
This summary is machine-generated.

The hitting accuracy tennis test (HATT) demonstrates excellent test-retest reliability for NCAA Division I players. This simple, inexpensive tool accurately measures tennis skill and monitors player development.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Skill Acquisition

Background:

  • Assessing tennis player accuracy is crucial for performance evaluation.
  • Existing tests may lack reliability or practicality for coaches.
  • The Hitting Accuracy Tennis Test (HATT) was developed to address these needs.

Purpose of the Study:

  • To evaluate the test-retest reliability of the Hitting Accuracy Tennis Test (HATT).
  • To determine if the HATT provides consistent results over time for skilled tennis players.

Main Methods:

  • Twelve NCAA Division I tennis players performed 15 ground strokes in four directions.
  • The court was divided into 12 zones, each with a point value (1-6).
  • Total score, unforced errors, and shot index were analyzed for reliability.

Main Results:

  • No statistically significant differences were found between trials for any measurement.
  • Division I players demonstrated consistent accuracy in hitting specific court targets.
  • Minimal daily variation in performance was observed.

Conclusions:

  • The HATT is a reliable and accurate assessment tool for measuring tennis skill accuracy in trained athletes.
  • The HATT is a simple, inexpensive training device for monitoring player development.
  • Coaches can effectively use the HATT to track improvements in tennis players' accuracy.