| To: | "Neung-Hwan Oh" <ultisol@gmail.com> |
|---|---|
| Subject: | Re: group by |
| From: | "Wensui Liu" <liuwensui@gmail.com> |
| Date: | Wed, 14 Mar 2007 17:02:26 -0400 |
| Cc: | s-news@wubios.wustl.edu |
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I am not sure if in Splus, there is a nice function like tapply() in R or not. On 3/14/07, Neung-Hwan Oh <ultisol@gmail.com> wrote: Hello, How can you calculate the following example in s-plus? In Access, it is relatively easy with "Group By" and I am wondering whether there is a similar function that I missed in S-Plus. "From this table" site.no date time value 1 1989/04/27 12:00 1.0 2 1975/10/01 19:00 2.0 2 1975/10/01 20:00 4.0 3 1993/04/10 09:00 3.0 3 1993/04/10 12:00 6.0 3 1993/04/10 15:00 9.0 "To this (averages per date per site)" + (count column?) 1 1989/04/27 12:00 1.0 (1.0) 2 1975/10/01 19:30 3.0 (2.0) 3 1993/04/10 12:00 6.0 (3.0) Many thanks! NH -- WenSui Liu A lousy statistician who happens to know a little programming (http://spaces.msn.com/statcompute/blog) |
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