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Validity and Reliabilty (the more latent a charac. is, the more... (its…
Validity and Reliabilty
validity of measure
substantively accurate measure, covers in correct and complete manner:
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the more latent a charac. is, the more...
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Reliability
What is reliability
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consistent over time, space, coder and circumstances
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Validity vs. reliability
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criterion are in tension with each other, raising one might reduce the other
Improving reliability
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simplify coding task
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consequence: content, reality, meaning of measured concept is reduced
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manifest/latent, meaning:
- (in)dependent on substantive context
- (in)dependent on mental schemes
- provided by content/coder
- observed/constructed
- objective/subjective
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- be realistic: perfect V + R is impossible
- don't fixate on 1 criterion: both need to be satisfactory
- look for balance: design measurement instrument so that both criterion are sufficient
Codebook:
- definition of registration and context units
- measured variables
- coding categories
- rules and procedures
- examples
Causes of coder differences
Codebook:
- multiple dimensions of variable (need beter OP)
- unclear categories (need e.g.)
Coders:
- one does not follow instructions
- fatigue
- unclear context --> interpreted differently due to background, deal with this:
- give context unit
- tackle cultural issues
- make rules about BG knowledge (what is general knowledge)
Test sample:
- sample does not contain characteristics