Cochran's C Test Calculator
Test if the largest variance is significantly larger than expected under homogeneity.
Group Data
Cochran's C Statistic
0.6680
Variances Are Homogeneous
maxMax Variance
107.3667
sumSum of Variances
160.7333
cvCritical Value
0.7457
kGroups (k)
3
Group Variances
Group 1 (n=6)s^2 = 19.7667
Group 2 (n=6)s^2 = 33.6000
Group 3 (n=6) (max)s^2 = 107.3667
Formula
C = max(s^2) / Sum(s^2)
Interpretation
The largest variance is within the expected range for homogeneous groups.