DOE结果分析求助

3因子2水准无中心点不重复试验,试验结果顺序排列47.6/66.3/68.3/74.8/50.7/52.7/59.5/61.2
结果分析stat>DOE>Factorial>Analyze Factorial Design...
运行结果如下:
Estimated Effects and Coefficients for Y (coded units)

Term Effect Coef
Constant 60.138
A 7.225 3.613
B 11.625 5.812
C -8.225 -4.113
A*B -3.125 -1.562
A*C -5.375 -2.687
B*C -2.975 -1.488
ABC 2.975 1.488


S = *


Analysis of Variance for Y (coded units)

Source DF Seq SS Adj SS Adj MS F P
Main Effects 3 509.98 509.98 169.99
2-Way Interactions 3 95.01 95.01 31.67
3-Way Interactions 1 17.70 17.70 17.70
Residual Error 0 *
Total 7 622.70
问题:为什么F/P值都是*?请教高人指点一二......