[R] Stratified weighted statistics

[Erich Neuwirth]

In the help file for summarize
in the examples section search for the following line

# Get stratified weighted means

Vikas Rawal wrote:
>> Please look again at the help files for summarize and wtd.mean which 
>> show how to do this.

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Erich Neuwirth, University of Vienna
Faculty of Computer Science
Computer Supported Didactics Working Group
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