Variance that is specific to a single variable and not shared with other variables is known as what?

Variance that is specific to a single variable and not shared with other variables is known as what?

• A. Unique variance
• B. Unstructured
• C. Unsystematic variation
• D. Upper quartile

Answer: (A)

Unique variance is the portion of a variable’s variance that is not shared with other variables. It represents what is specific to that variable, including measurement error, and is distinct from the variance explained by common factors that influence multiple variables. In multivariate analyses, total variance is often decomposed into shared (common) variance and this unique variance for each variable. For example, if several test scores reflect a general ability factor, the variance in one test that isn’t explained by that general factor—and isn’t shared with the other tests—counts as its unique variance. Other terms don’t fit as well: unstructured refers to a lack of predefined structure rather than a variance component; unsystematic variation can describe random error but the standard label for the specific, non-shared part is unique variance; upper quartile is simply a percentile, not a variance component.

Unique variance is the portion of a variable’s variance that is not shared with other variables. It represents what is specific to that variable, including measurement error, and is distinct from the variance explained by common factors that influence multiple variables. In multivariate analyses, total variance is often decomposed into shared (common) variance and this unique variance for each variable.

For example, if several test scores reflect a general ability factor, the variance in one test that isn’t explained by that general factor—and isn’t shared with the other tests—counts as its unique variance.

Other terms don’t fit as well: unstructured refers to a lack of predefined structure rather than a variance component; unsystematic variation can describe random error but the standard label for the specific, non-shared part is unique variance; upper quartile is simply a percentile, not a variance component.