# Estimated *g* factor loading

© Paul Cooijmans

## Explanation

Reports for particular tests give conservatively estimated minimum *g* factor loadings. These are obtained by taking the square root of the weighted average of that test's correlations with other tests, and estimate the correlation of that test with *g*, the largest common factor between tests for mental abilities. Actual *g* factor loadings may be provided later, when there is enough data for factor analysis (which requires a set of tests among which all of the intercorrelations are known; that is, for which the correlation between every combination of two tests is known; that is, for which there is a group of candidates of whom each has taken each of the tests).