[R] how to calculate summary statistics for each factor

[karena]

I have a dataset like the following:

subject   class     value
123        1            10
124        1             12
125        1            12
223        2            23
224       2             18
225         2            19
323        3             21
324       3              10
325       3               19
326       3               20

how to calculate the summary value for each factor?
thanks

karena
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