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errors appears in my time Series regression fomula

5 messages · snowcat wong, jim holtman

snowcat wong
# 
Dear all,

 

I found really difficult with the time series questions, please help me with this monthly airline series!

 

I have run the following r code, and there is an error appeared at the end.  The data files was enclosed in the email.

I'm sorry the errors message appeared in chinese, but it says "plot.xy(xy.coords(x, y), type = type, ...) :

errors in argument has more than 3 matches"
Read 144 items
??? plot.xy(xy.coords(x, y), type = type, ...) : 
  ??3?????????????


Also, for a similar data set quarterly sales of spirits series, what is the best model to use?? Should I use ARIMA??

 

 

 

Many thanks and regard,

Cathy Wong
 		 	   		  
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snowcat wong
# 
Dear all,

 

I am having difficulty to built a model of quarter sales of spirits data, and deciding which is the best model. The yfit2, yfit3, and yfit4 lines was not appeared right at the end. The data and script is enclosed with this email.

 

I am using the harmonic regression model to exam the periodogram of the residuals. I am not sure this step is right or not? Which is the best formula to analysis the trend and seasonality for this data set? AR, MA or ARMA and how to decide?  

 

Please help!!

 

many thanks and regard,

Cathy Wong

 

 
 		 	   		  
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snowcat wong
# 
Dear all,
 
I am having difficulty to built a model of quarter sales of spirits data, and deciding which is the best model. The yfit2, yfit3, and yfit4 lines was not appeared right at the end. The data and script is enclosed with this email.
 
I am using the harmonic regression model to exam the periodogram of the residuals. I am not sure this step is right or not? Which is the best formula to analysis the trend and seasonality for this data set? AR, MA or ARMA and how to decide?  
 
Please help!!
 
many thanks and regard,
Cathy Wong
 
 



Got a cool Hotmail story? Tell us now 		 	   		  
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2 days later
snowcat wong
# 
Dear all,
 
I am having difficulty to built a model of quarter sales of spirits data, and deciding which is the best model. The yfit2, yfit3, and yfit4 lines was not appeared right at the end. The data and script is enclosed with this email.
 
I am using the harmonic regression model to exam the periodogram of the residuals. I am not sure this step is right or not? Which is the best formula to analysis the trend and seasonality for this data set? AR, MA or ARMA and how to decide?  
 
Please help!!
 
many thanks and regard,
Cathy Wong
 
  		 	   		  
_________________________________________________________________
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