[R] tapply with unequal length of arguments

[ronggui]

2006/3/12, Stefanie von Felten, IPW&IfU <sfelten at uwinst.unizh.ch>:
> Hi everyone,
>
> Is it possible to use tapply(x,y,mean) if not all groups of x by y are
> of the same length (for example if you have one missing observation)?

Yes,It works.

> I tried tapply(x,y,mean,na.omit=T) but it doesn't work!
What does "it doesn't work" mean exactly?Can you give an example and
the error msg?

> Steffi
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> Stefanie von Felten
> Doktorandin
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> ETH Zürich
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--
黄荣贵
Deparment of Sociology
Fudan University