[R] get statistics by group

[Yu-Ling Wu]

Hi,

I have a data set look like this:

=================================
Fruit   Quty
apple   20
banana  10
orange  17
apple   30
apple   15
orange  26
banana  15
.........and so on ..........
=================================

The level of fruit is 30, that is, there are 30 
different fruits. I'd like to compute some simple 
statistics for each different fruit and get output 
like this:

=================================
        min   max  avg  median
apple   12     70   25     22
banana  10     65   19     18
orange  19     50   27     25
....... and so on........
=================================

Please help me with this.

Thanks,
Yu-Ling Wu

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