Rasch Analysis

How it works

Risks & contraindications

Evidence quality

Highlighted claims

• Rasch analysis was used to assess the test's validity and reliability. — Test to assess claims about treatment effects for Spanish primary school children: the development process and cross-sectional validation study of the test
• The test's underlying measurement assumption was that all items assessed the same ability: applying IHC Key Concepts to treatment claims. — Test to assess claims about treatment effects for Spanish primary school children: the development process and cross-sectional validation study of the test
• Reliability was acceptable according to Cronbach's alpha and the Person-Separation Index. — Test to assess claims about treatment effects for Spanish primary school children: the development process and cross-sectional validation study of the test
• Items 4 and 9 underdiscriminated and added little measurement value, while item 21 showed gender-related differential item functioning. — Test to assess claims about treatment effects for Spanish primary school children: the development process and cross-sectional validation study of the test
• Overall Rasch findings supported the iCLAIM Test as a valid and reliable measure of children's ability to assess treatment claims. — Test to assess claims about treatment effects for Spanish primary school children: the development process and cross-sectional validation study of the test
• The person-item distribution indicated acceptable targeting, though the test was somewhat challenging for the cohort. — Test to assess claims about treatment effects for Spanish primary school children: the development process and cross-sectional validation study of the test