[R] Identifying matched groups based on a rule

[Ala' Jaouni]

Hello,

I'm trying to create a table like below for a data set representing one
test and indexed by five categories.

Categories are grouped into a number of buckets (three in this case: A, B,
C) based on the level at which the difference between groups is significant
(0.05).

Category,  Group,  Mean
1,  A,  94.9
2,  A,  94.8
3,  A+B,  93.4
4,  B+C,  91.4
5,  C,  91.1

Is there a way to do this in R?

Thanks.

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