|
Contents [Hide] |
For each group:
m = Mean
v = Variance
n = Number of items
Use the maximum and minimum means for all groups in the following equation:
t = (m1 - m2) / (v1/n1 + v2/n2)1/2
We use a risk level of .05 to determine if the difference between the groups is significant.
Use the maximum and minimum variances for all groups in the following equation:
F = v1/v2 (where v1 is greater than v2)
We use a risk level of .05 to determine if the difference between the groups is significant.
Calculate correlation coefficient for X = subgroup average and Y = numeric traceability value.
Correlation coefficient = 0 means no significant variation attributed to the traceability.
Correlation coefficient = 1 or –1 means that changes in traceability are significant for X.
For more information on calculating the correlation coefficient, see Calculating Correlation and Regression
For each group:
m = Mean
v = Variance
n = Number of items
t-Test
Use the maximum and minimum means for all groups in the following equation:
t = (m1 - m2) / (v1/n1 + v2/n2)1/2
We use a risk level of .05 to determine if the difference between the groups is significant.
F-Test
Use the maximum and minimum variances for all groups in the following equation:
F = v1/v2 (where v1 is greater than v2)
We use a risk level of .05 to determine if the difference between the groups is significant.
Calculate correlation coefficient for X = subgroup average and Y = numeric traceability value.
Correlation coefficient = 0 means no significant variation attributed to the traceability.
Correlation coefficient = 1 or –1 means that changes in traceability are significant for X.
For more information on calculating the correlation coefficient, see Calculating Correlation and Regression.