Re: [R] auto.arima function in R

2014-11-20 Thread Prof Brian Ripley
There is no auto.arima function 'in R'.  Do give credit/blame where it 
is due (probably package 'forecast').


Without the reproducible example the posting guide asked for, we can 
only guess wildly.  I at least decline to do so.



On 20/11/2014 10:52, Akhil dua wrote:

Hello every one,

I am using daily data of the flight departure.

Departure Date   Load (Seats booked/Capacity)
12/01/2011 10
13/01/2011 12
14/01/2011 09

I want to fit an arima model to the data for forecasting the load for the
next day flight. I am using auto.arima function in R.

Residuals and fitted values that I am getting from auto.arima has NAs
whereas I don't have any NA in my original data.

Can anyone please help me with the probable reason for this.





--
Brian D. Ripley,  rip...@stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
1 South Parks Road, Oxford OX1 3TG, UK

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Re: [R] auto.arima function in R

2014-11-20 Thread Akhil dua
I am sorry for violating the guidelines but the data that I am using is
highly confidential so I can't disclose it.I posted sample data just for
giving the flavour of the data.
On Nov 20, 2014 5:46 PM, Prof Brian Ripley rip...@stats.ox.ac.uk wrote:

There is no auto.arima function 'in R'.  Do give credit/blame where it is
due (probably package 'forecast').

Without the reproducible example the posting guide asked for, we can only
guess wildly.  I at least decline to do so.



On 20/11/2014 10:52, Akhil dua wrote:

 Hello every one,

 I am using daily data of the flight departure.

 Departure Date   Load (Seats booked/Capacity)
 12/01/2011 10
 13/01/2011 12
 14/01/2011 09

 I want to fit an arima model to the data for forecasting the load for the
 next day flight. I am using auto.arima function in R.

 Residuals and fitted values that I am getting from auto.arima has NAs
 whereas I don't have any NA in my original data.

 Can anyone please help me with the probable reason for this.




-- 
Brian D. Ripley,  rip...@stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
1 South Parks Road, Oxford OX1 3TG, UK

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Re: [R] auto.arima function in R

2014-11-20 Thread peter dalgaard

On 20 Nov 2014, at 17:19 , Akhil dua akhil.dua...@gmail.com wrote:

 I am sorry for violating the guidelines but the data that I am using is
 highly confidential so I can't disclose it.I posted sample data just for
 giving the flavour of the data.

This happens, but then you need to simulate some data that show the effect. 

It's not happening with the fit from example(auto.arima), so clearly not 
always. 

-pd


-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd@cbs.dk  Priv: pda...@gmail.com

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