To read unbiased sample covariances, or to read sample standard deviations that are the square roots of unbiased sample variances:
1.Press (Menu: View→Analysis Properties).
2.Select the Bias tab
3.Under Covariances supplied as input, place a check mark next to Unbiased.
In an Amos program, use the InputUnbiasedMoments method of the AmosEngine class.