Validity vs reliability, introduction to Cosmin, general aspects, measurements properties
14 important questions on Validity vs reliability, introduction to Cosmin, general aspects, measurements properties
What does validity mean in research
- The result that one really aims for
- Does the instrument really measure what it wants to measure.
- Mean is wrong answer
What can help COSMIN taxonomy you with
What are the different types of reliability?
- Reliability (test-retest, inter-rater, intra-rater)
- Measurement error (test-retest, inter-rater, intra-rater)
- Internal consistency
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What are the different aims of your measurements?
- Who's perspective?
- Patient reported or clinician reported
- Objective or subjective?
- Disease specific or generic?
- What exactly do you want to measure?
What are the golden rules for a survey?
- Understanding of the project goals. (what do you want to learn? Who is target audience?)
- Keep it simple and use logic. (less is more)
- Field test (complete the survey yourself)
- Appearance is everything
What is objectivism in research?
- Many measurements incorrectly labelled as objective -> imaging tests -> still need a clinician (like MRI, X-Ray)
What is subjectivism in research
What is used as a substitute to a real outcome (clinical outcome)
Examples:
- Biomarkers
- Blood pressure instead of CVD
- Bone density instead of bone fractures
What is the problem with surrogate endpoints (SE)
- Might not be in causal pathway of the actual outcome (disease)
What are seven tips for good survey questions?
- Question is interpreted in a consistent manner
- Question people are willing to answer
- Explain why information is needed
- Assure you keep information anonymous
- Question is answered truthfully (watch out for social desirability)
- Question w/ a known answer
- Avoid double barrelled questions
- Avoid biased terms or wording
- Pretest your questions!
Who are part of action research?
Where does deductive move towards and some more information about deductive
- There is already information about the subject
- Use theory and knowledge to write a hypotheses and use data to test these hypotheses
- Literature needed
What is inductive research
- Plans -> data collection -> analyse data -> patterns? -> has a pre-existing theory
- explorative research
- Intuitive
How do people interpret the meaning of objections and actions ? How they act upon these interpretations?
- Arise from social interaction
- Meanings are not fixed or stable
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