,
where 
.
For the memory-cache study.
SSA = 5547 SSB = 1083 SSAB = 300 SSE = 102 SST = 7032 SSO = 20172 SSY = 27204
Thus the variation attributed to each factor and to error is
Total variation due to A = SSA/SST = 5547/7032 = 78.9%
Total variation due to factor B = 15.4%
Total variation due to interaction AB = 4.3%
The remaining 1.4% is due to experimental error.