Does anyone have a program for comparing interaction means (similar to HSD.test of agricolae) for a split or strip plot design? For those who are familiar with SAS I am looking for something similar to the DIFF option of the LSMEANS statement of PROC MIXED and the PDMIX800 macro. The diff option performs multiple mean comparison from single or factorial experiments then the macro translates the comparison by putting letters beside the means. 
 
Many thanks to anyone who will respond to this email.
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