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).