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Long-term Depression

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Related Experiment Video

Updated: Jul 12, 2026

A New Method for Inducing a Depression-Like Behavior in Rats

A New Method for Inducing a Depression-Like Behavior in Rats

Published on: February 22, 2018

The Depression-Happiness Scale: test-retest data over two weeks.

C A Lewis¹, M A McCollum, S Joseph

¹School of Psychology and Communication, University of Ulster, Magee College, Londonderry, Northern Ireland.

Psychological Reports

|February 15, 2000

Summary

The Depression-Happiness Scale shows good test-retest reliability over two weeks, indicating it measures stable happiness traits rather than temporary states.

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Area of Science:

Psychology
Psychometrics

Background:

Assessing psychological well-being requires reliable measurement tools.
The Depression-Happiness Scale (DHS) is used to evaluate emotional states.

Purpose of the Study:

To further investigate the psychometric properties of the Depression-Happiness Scale.
To determine the reliability and nature (trait vs. state) of the DHS.

Main Methods:

Test-retest reliability study.
Administered the Depression-Happiness Scale to 54 female university students in Northern Ireland over a two-week interval.

Main Results:

High test-retest stability was observed (r = .70).
No significant change in scores between the two measurement points.
The scale demonstrated consistency over the two-week period.

Conclusions:

The Depression-Happiness Scale exhibits strong psychometric properties.
The scale appears to function as a trait measure of happiness, reflecting stable individual differences.