The CVR specifically addresses whether an item is essential for the tool. Unlike CVI, which looks at general relevance, CVR focuses on necessity by asking experts to judge each item as essential, useful but not essential, or not necessary. The resulting ratio indicates how many experts agree on the indispensability of an item, guiding decisions about whether to keep or remove it. This makes CVR particularly useful during the development stage, as it ensures that the final tool avoids redundancy and remains focused. Removing items with low CVR values helps create a more concise and meaningful instrument, while maintaining scientific rigor. In this way, CVR improves both the precision and efficiency of the measurement process.
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