Hi,
I need to determinate HSD value from a matrix like that

Thesis  Days       A1
Cx      0       66.07
Cx      0       60.24
Cx      0       42.86
Tw      0       66.07
Tw      0       60.24
Tw      0       42.86
Aa      0       66.07
Aa      0       60.24
Aa      0       42.86
Qe      0       66.07
Qe      0       60.24
Qe      0       42.86
Cx      56      310.86
Cx      56      223.17
Cx      56      186.77
Tw      56      149.42
Tw      56      127.75
Tw      56      138.59
Aa      56      130.24
Aa      56      214.83
Aa      56      137.95
Qe      56      186.64
Qe      56      189.09
Qe      56      187.87

this is my script

require(agricolae)
file <- "A1.txt"
data_table <- read.table(file, header=T, row.names=NULL)

attach(data_table)
anova <- aov(A1 ~ factor(Thesis)*factor(Days))
detach(data_table)

first of all, I need to know if my script has conceptual errors

secondly, I need to calculate HSD between Thesis:Days means
I try with Tukey.test command from agricolae package, but it do not work
I can use only these commands

Tukey.test(anova, "Thesis")
Tukey.test(anova, "Days")

but not

Tukey.test(anova, "Thesis*Days")

how can I do?

my apologies for the banal questions, but I'm taking the first steps in
statistical computing

Thanks,
Roberto

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