The Fisher information components are equal to the log geometric variances and log geometric covariance. The log geometric variances are positive for all values of the shape parameters. Information such as&colon; estimation, sufficiency and properties of variances of estimators. Student's "t"-test assumes that the two populations have normal distributions with equal variances. Good quality measures need to have high satisfaction loadings, good reliability, and low error variances. The simplest case obtains where all residual variances are modeled explicitly. Biological reasons for gender variances in flashbulb memory may be explained by amygdala asymmetry. Otherwise it follows an F-distribution scaled by the ratio of true variances. These are Hermite polynomial sequences of different variances; see the material on variances below. The results suggest that the equality of variances assumption can't be made. No variances in radiation levels as a result of the incident were detected. This is due to the variances in Okun's coefficient. There are many additional variances in color symbolism between cultures. Tukey tests also apply to two variances. The Lehmann test is a parametric test of two variances.