For an index or scale to be considered unidimensional,its component items should be indicators of only one dimension.

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Yes, for an index or scale to be considered unidimensional, its component items should be indicators of only one dimension. This means that all the items in the index/scale should be measuring the same concept or construct. If the items are measuring different constructs, then the index/scale is considered multidimensional.

For an Index or Scale to Be Considered Unidimensional,its Component