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Validity and reliability--What's it all about? Part 1. Validity in quantitative studies.

Alison Twycross·Linda Shields
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Alison Twycross, Linda Shields. 2004. Validity and reliability--What's it all about? Part 1. Validity in quantitative studies.. https://doi.org/10.7748/paed2004.11.16.9.28.c954

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