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Average the same elements of the list

• To: mathgroup at smc.vnet.net
• Subject: [mg130863] Average the same elements of the list
• From: BBabic <bipsich101 at gmail.com>
• Date: Wed, 22 May 2013 02:18:09 -0400 (EDT)
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• Delivered-to: l-mathgroup@wolfram.com
• Delivered-to: mathgroup-outx@smc.vnet.net
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Hello,
I have list which is something like 
data={
{{a1,b1,c1},d1},{{a2,b2,c2},d2}}
I would like to get new list which gets average of the second elements if the first elements in the sublists are all the same.
Namely if a1=a2,b1=b2,c1=c2
new list would look like
datanew={{a1,b1,c1},Mean[{d1,d2}]
Is there an elegant way to do this ?
Thanks!

• Follow-Ups:
  • Re: Average the same elements of the list
    • From: Bob Hanlon <hanlonr357@gmail.com>
  • Re: Average the same elements of the list
    • From: Murray Eisenberg <murray@math.umass.edu>
  • Re: Average the same elements of the list
    • From: Tomas Garza <tgarza10@msn.com>