Week 4 Flashcards
What are the features of a good measurement?
Reliable, repeatable, reproducible, accuracy, precision, stability/drift.
What is operationalising?
To operationalise means to turn a concept of interest into a measured or manipulated variable.
What do convergent, divergent/discriminant and known-groups validity relate to?
Operationalising.
What is convergent validity?
The measure should correlate more strongly with other measures of the same contracts.
What is divergent/discriminant validity?
The measure should correlate less strongly with measures of different constructs.
What is known-groups validity?
How well a test or measure distinguishes between known group differences.
Qualitative vs quantitative data.
Qualitative - content from focus groups, diaries, etc.
Quantitative - nominal, ordinal, interval, ratio.
What is the definition of nominal, ordinal, interval and ratio.
Nominal - cat with no order; ordinal - cat with an order; interval - equal intervals with no zero value; ratio - equal intervals with a zero value.
Reliability vs validity.
Reliability - refers to how consistent the results of a measure are
Validity - concerns whether the operationalisation is measuring what it is supposed to measure.
What can scatterplots and correlation co-efficent tell us about?
Reliability.
What are the three kinds of reliability?
Test-re-test, inter-rater, internal reliability.
What is test-re-test reliability?
The researcher gets consistent scores every time he or she uses the measure.
What is inter-rater validity?
Two or more independent observers will come up with consistent, or similar, findings.
What is internal reliability?
A study participant will give a consistent pattern of answers no matter how the researcher has phrased the question
