R help - Jul 2007 - help again

hi
i try to use arima and holtwinter to predict drought from 1895-2006
but i cannot read whole period of time and i try to do the exponent fitting,
but it comes out as the coordinate x-y error
i send the source code and data to take a look
if anyone can help me, i am really new in R

thank u so much
jam

> hi
> i try to use arima and holtwinter to predict drought from 1895-2006
> but i cannot read whole period of time and i try to do the exponent
> fitting,
> but it comes out as the coordinate x-y error
> i send the source code and data to take a look
> if anyone can help me, i am really new in R
>


"PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html

and provide commented, minimal, self-contained, reproducible code."

This makes it much easier to help! (how do your numbers look like e.g.) You
don't need to send the whole dataset but a few lines would be nice plus what
commands you've done to receive those errors...

Stefan


-=-=-
... Lotteries are a tax on ignorance. (A. Smith - attributed)

On Jul 2, 2007, at 6:22 PM, umarporn charusombat wrote:
> hi
> i try to use arima and holtwinter to predict drought from 1895-2006
unless you have access to time-travel isn't this better called  
retrodiction?

ingmar
> but i cannot read whole period of time and i try to do the exponent  
> fitting,
> but it comes out as the coordinate x-y error
> i send the source code and data to take a look
> if anyone can help me, i am really new in R
>
> thank u so much
> jam
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting- 
> guide.html
> and provide commented, minimal, self-contained, reproducible code.

i try to predict the drought  from the precipitation index of each month for
100 year, from 1985 to 2006

here is my code, i have the

pdsi<-read.csv("pdsi.csv")

pdsi<-ts(pdsi,start=1985,freq=100)

HoltWinters(pdsi)

plot(pdsi)

lines(HoltWinters(pdsi)$fitted,col="red")

pdsi.hw<-HoltWinters(pdsi)

predict(pdsi.hw,n.ahead=48)

plot(pdsi,xlim=c(1985,2006))

lines(predict(pdsi.hw,n.ahead=48),col=2)
my error message is
*Error in xy.coords(x, y) : 'x' and 'y' lengths differ*

** if anyone know please give me advice
*thank in advance*
*jam*

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