Quantitative - data collection issues: outcomes, measurement, reliability, validity Flashcards Preview

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Flashcards in Quantitative - data collection issues: outcomes, measurement, reliability, validity Deck (8)
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1

What is the main outcome for a study called?

primary outcome
(can also have secondary outcomes)

2

What do outcomes have to be?

-meaningful: outcomes have to be credible, meaningful and related to the issue of interest
-measurable
-responsive- change that occurs is demonstrated in the outcome measure
-measurements should be valid and reliable

3

What is reliability?

addresses whether repeated measurements provide a consistent result given the same initial circumstances

4

What is validity?

does your measurement, process or assessment actually measure what you intend it to measure?

5

What is internal validity?

study results legitimate because of the way the study was conducted: did the IV really change the DV?

without internal validity you cant have external validity

6

What are threats to internal validity?

-history: events happening outside study
-maturation: changes that happen over time
-testing: change due to experience of the test
-instrumentation: changes in measurement rather than change in status
-mortality: differences in study drop out
-selection bias: PPs different to non-PPs

7

What is external validity?

or generalisability
-concerns whether results are transferable to other groups

8

What are threats to external validity?

-selection effects: generalisability to other populations, when ideal sample population cant be obtained
-reactive effects: response to just being in a study (hawthorne effect)
-measurement effects: measurement and testing affects the generalisability