Qualitative and Quantitative Measurement - Index construction

3 important questions on Qualitative and Quantitative Measurement - Index construction

What does an unweighted index do?

It gives each item equal weight.
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What is the problem when data is missing?

Validity and reliability are threatened and there are no ways in which it can be fully solved.
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What is the best thing to do when combining several items into an index?

To standardize items on a common base.
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