Forecast - Partial autocorrelation function

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Merten
Merten 2012-4-17
Hi Forecast-community,
Currently I am stuck in a tricky, but simple problem. To estimate my forecast model (SARIMA) I need a partial autocorrelation function. I use the toolbox parcorr. My command is
[PACF,plags,pBounds]=parcorr(Series,nLags,R,nSTDs);
In general the PACF output should be between -1 and 1 but I have outputs which exceeds these boundaries.
My Questions:
Does I have an error when PACF exceeds the boundaries?
How can I fix this output?
Thanks for any help
Merten

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