[R] Formatting data for bootstrapping for confidence intervals
Rui Barradas
ruipbarradas at sapo.pt
Thu Oct 11 20:35:40 CEST 2012
Hello,
To aggregate the data use, yes, it's exists, function aggregate.
with(dat, aggregate(cbind(X, Xn, Y), list(Area, DATE), FUN = sum))
# output
Group.1 Group.2 X Xn Y
1 1 1/10/10 1 1 0
2 1 1/11/10 0 0 1
3 1 1/12/10 3 0 0
4 2 2/12/10 2 1 1
5 2 2/13/10 3 0 0
6 2 2/14/10 4 1 0
7 3 7/27/11 3 1 0
8 3 7/28/11 7 2 2
9 3 7/29/11 3 1 0
And take a look at package boot. Maybe you'll find something there.
Hope this helps,
Rui Barradas
Em 11-10-2012 16:55, Paul Wennekes escreveu:
> Hi all,
>
> New to R, so this may be obvious to some.
> I've been trying to figure this out for a while, I have a dataset "events"
> that looks something like this:
>
> Area NAME DATE X Xn Y
> 1 X 1/10/10 1 1 0
> 1 Y 1/11/10 0 0 1
> 1 X 1/12/10 1 0 0
> 1 X 1/12/10 1 0 0
> 1 X 1/12/10 1 0 0
> 2 X 2/12/10 1 1 0
> 2 X 2/12/10 1 0 0
> 2 Y 2/12/10 0 0 1
> 2 X 2/13/10 1 0 0
> 2 X 2/13/10 1 0 0
> 2 X 2/13/10 1 0 0
> 2 X 2/14/10 1 0 0
> 2 X 2/14/10 1 0 0
> 2 X 2/14/10 1 1 0
> 2 X 2/14/10 1 0 0
> 3 X 7/27/11 1 0 0
> 3 X 7/27/11 1 1 0
> 3 X 7/27/11 1 0 0
> 3 X 7/28/11 1 0 0
> 3 X 7/28/11 1 1 0
> 3 X 7/28/11 1 0 0
> 3 X 7/28/11 1 0 0
> 3 Y 7/28/11 0 0 1
> 3 X 7/28/11 1 0 0
> 3 X 7/28/11 1 1 0
> 3 Y 7/28/11 0 0 1
> 3 X 7/28/11 1 0 0
> 3 X 7/29/11 1 0 0
> 3 X 7/29/11 1 0 0
> 3 X 7/29/11 1 1 0
>
> X and Y are events. Every row represents a single event happening, with a 1
> indicating which one happens at that time. Xn indicates X happening at
> night. I want to bootstrap these events over days but I think I need to
> summarize them first, ie. get something that looks like this:
>
> Area DATE X Xn Y
> 1 1/10/10 1 1 0
> 1 1/11/10 0 0 1
> 1 1/12/10 3 0 0
> 2 2/12/10 2 1 1
> etc.
>
> and then for each Area, bootstrap the data over the days. Any ideas? I've
> tried using the 'reshape' package but I don't know how to sum over parts of
> the columns as defined by the DATE values...
>
> Many thanks ahead!
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Formatting-data-for-bootstrapping-for-confidence-intervals-tp4645860.html
> Sent from the R help mailing list archive at Nabble.com.
>
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