Measurement Tools Flashcards
What are the types of measurement tools?
descriptive discriminative, predictive, evaluative and diagnostic
What do descriptive measurement tools do?
describes the event/functional status
What do discriminative measurement tools do?
discriminate between different concepts or qualities that we want to assess. Compare against normative data.
What do predictive measurement tools do?
predict future events (may also discriminate between events). Can classify people into predetermined categories or can predict future abilities and outcomes
What do diagnostic measurement tools do?
diagnose a health condition
What do evaluative measurement tools do?
evaluate health outcomes, detect change over time. In order to do this they must be sensitive to change and should have a good test-retest reliability
What is the purpose of measurement?
to give an operational/practical definition of the construct of the question/purpose
What is the difference between 2 measurements called?
variation in the measurements/error
When is error present?
always
What influences error?
client’s attributes, evaluation/instrument, therapist/rater and environment
What is the sum of measurement error?
observed score = true ability + random error +/- systematic error
What is systematic error?
bias
What is random error?
variability
What is a reliable tool?
One that produces consistent results over repeated trials
What can effect the stability of a tool?
translation of instruments - may not be culturally appropriate between different populations
When would you use a measurement tool?
- to gather info
- to diagnose
- provide prognostic info
- provide initial baseline assessment of functional status
- progress or outcome of therapy