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Related Experiment Video

Updated: Jan 12, 2026

Qualitative and Quantitative Validation of Tools with Rating Scales Aimed at Assessing the Quality of University Service-Learning

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Published on: August 29, 2025

Continuous Rating Scale Analytics (CoRSA): A tool for analyzing continuous and discrete data with item response

Yeh-Tai Chou¹, Yao-Ting Sung², Wei-Hung Yang³

¹Research Center for Psychological and Educational Testing, National Taiwan Normal University, Taipei, Taiwan.

Behavior Research Methods

|November 4, 2025

Summary

Continuous rating scales like the visual analogue scale (VAS) are now easier to analyze with the new Continuous Rating Scale Analytics (CoRSA) tool. CoRSA enhances data analysis for both continuous and discrete scales, improving research utility.

Keywords:

CoRSA Continuous data Item response model VAS-RRP Visual analogue scale

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Area of Science:

Psychometrics
Statistical modeling
Data analysis

Background:

Continuous rating scales, such as the visual analogue scale (VAS), are underutilized in research compared to discrete scales like the Likert scale.
This underutilization stems from a lack of validated analytical tools, user-friendly interfaces, and supporting theoretical/empirical research.

Purpose of the Study:

To address the gaps in analyzing continuous rating scales by developing and validating analytical tools.
To enhance the accessibility and usability of continuous rating scale data analysis for researchers and practitioners.

Main Methods:

Development of the Continuous Rating Scale Analytics (CoRSA) algorithm and software.
Evaluation of CoRSA's efficacy against existing tools (pcIRT, ConQuest) using simulated and empirical data.
Integration of CoRSA into the VAS-RRP 2.0 platform to improve user accessibility.

Main Results:

CoRSA demonstrated superior parameter recovery for continuous data and comparable performance for discrete data.
Empirical analysis using VAS and Likert scales with CoRSA showed good model-data fit and effective data rescaling.
The integration of CoRSA into VAS-RRP 2.0 enhanced usability for users without statistical expertise.

Conclusions:

CoRSA is a validated tool for analyzing both continuous and discrete rating scale data.
The developed tool enhances the utility and application of continuous rating formats in various research settings.
Increased accessibility of advanced statistical analysis promotes wider adoption of continuous rating scales.