[R] time series analysis

[Pascal Oettli]

Hello,

Maybe functions "xts", "endpoints" and "period.apply" of the "xts"
package might help you.

Regards,
Pascal


On Fri, Feb 28, 2014 at 1:32 AM, Yang Yang <simonyangyang at gmail.com> wrote:
> Hi
>
> Currently I am working on a river discharge data analysis. I have the daily
> discharge record from 1935 to now. I want to extract the annual maximum
> discharge for each hydrolocial year (*start from 01/11 to next year 31/10*).
> However, I found that the hydroTSM package can only deal with the natural
> year. I tried to use the "zoo" package, but I found it's difficult to
> compute, as each year have different days. Does anyone have some idea?
> Thanks.
>
> the data looks like:
>
> 01-11-1935 66302-11-1935 59603-11-1935 45004-11-1935 38105-11-1935
> 35406-11-1935 312
>
> my code:
>
> mydata<-read.table("discharge")
> colnames(mydata) <- c("date","discharge")
>
> library(zoo)
> z<-zooreg(mydata[,2],start=as.Date("1935-11-1"))
>
> mydta$date <- as.POSIXct(dat$date)
>
> q.month<-daily2monthly(z,FUN=max,na.rm = TRUE,date.fmt =
> "%Y-%m-%d",out.fmt="numeric")
> q.month.plain=coredata(q.month)
>
> z.month<-zooreg(q.month.plain,start=1,frequency=12)
>
> Thanks very much.
>
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>
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-- 
Pascal Oettli
Project Scientist
JAMSTEC
Yokohama, Japan