Question: S Two-factor ANOVA, or two-way layout, with one observation per cell. Consider the situation of Example (12.34) for the case that ` D 1. Then
S Two-factor ANOVA, or two-way layout, with one observation per cell. Consider the situation of Example (12.34) for the case that ` D 1. Then V
wg D 0, and the results from
(12.34) are no longer applicable. Therefore, this experimental design only makes sense when it is a priori clear that the factors do not interact, so that the ‘additive two-factor model’
Xij D C ˛i C ˇj C p
v ij; ij 2 G;
applies; here ; ˛i; ˇj are unknown parameters that satisfy P
i2G1
˛i D 0 and P
j2G2
ˇj D 0. Characterise the linear space L of all vectors of the form .C˛i Cˇj /ij2G by a system of equations, determine the projection of the observation vector X onto L, and design an F -test of the null hypothesis H0 W ‘factor 1 has no influence’.
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