An experimental field was conducted at Mehoni ARC, Ethiopia having five varieties, five levels of harvesting age and three numbers of nodes. all the required data was collected properly. However, during analysis the main effect mean comparison was displayed with their respective letter but the two way and three way interaction was not. therefore, if there is any other option please remind me.
when using 0 1 coding, like genmod, the main effect only show the difference among the reference group, when interaction is used. If 1, -1 coding, the main effect value is not the difference with reference group, you need find the parameter by sum of others levels than multiply by -1. You can use contract+estimate option to get overall comparison as Firas's example, or conditional comparison. The main effect for categorical measure difference, the two ways interaction measure difference of difference, if the difference by one factor the same across the level for other factor. Three way interaction measure difference of difference of difference.
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