How can one minimise the errors in the measurements?
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Double check all measurements for accuracy. For example, double-enter all inputs on two worksheets and compare them.
Double check your formulas are correct.
Make sure observers and measurement takers are well trained.
Make the measurement with the instrument that has the highest precision.
Take the measurements under controlled conditions.
Pilot test your measuring instruments. For example, put together a focus group and ask how easy or difficult the questions were to understand.
Use multiple measures for the same construct. For example, if you are testing for depression, use two different questionnaires.
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