Simple Effects, Main Effects, and Interactions
Simple effects, main effects, and interactions will be explained using the following data set:
Table 1. Effect of two N rates of fertilizer on grain yield (Mg/ha) of two barley cultivars.
Fertilizer Rate (B)
Cultivar (A) 0 kg N/ha (b0) 60 kg N/ha (b1)
Larker (a0) 1.0 (a0b0) 3.0 (a0b1)
Morex (a1) 2.0 (a1b0) 4.0 (a1b1)
The simple effect of a factor is the difference between its two levels at a given level of the other
factor.