Multiple studies demonstrate that psychological rating scales such as the Subjective Happiness Scale and the Warwick-Edinburgh Mental Well-being Scale possess strong psychometric properties, enabling the reliable measurement of human happiness and well-being.
The retrieved literature extensively documents the development, translation, and validation of psychological rating scales designed to measure happiness and subjective well-being across diverse populations. Multiple studies report satisfactory internal consistency, test-retest reliability, and construct validity for these instruments. Therefore, the claim that such scales exist and reliably measure happiness is strongly supported.