Stefano,

On 13 April 2012 20:51, Stefano Sofia <stefano.sofia@regione.marche.it>wrote:

> I have a data frame as below specified.
> From the 1st of May to the 30th of September of several years (e.g. from
> 2004 to 2011) I have a frequency of accidents.
> I need the mean of accidents divided by weeks (i.e. the mean of accidents
> from the 1st to the 7th of May of all the years, from the 8th to the 14th
> of May,
> ..., from the 29th to the 31st of May, from the 1st to the 7th of July and
> so on).
> Is there an easy way to do that?
>

Take a look at
https://bitbucket.org/hd1/financeocr/raw/13c4990bd21b/visualizations/dayAmountsHist.Rto
get the subsets and sapply(list, mean, simplify=TRUE). -- H
-- 
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Envoyait de mon portable

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