How to identify the orders p and q for ARIMA model using least squares method?

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user6754312
user6754312 on 21 May 2015
I would like to identify the orders p and q for ARIMA model using least squares method in Matlab. I have got also two data files (one with noise and one without)
Previously I identified p and q for AR and MA using ACF function and PACF, but now I have mixed model (ARIMA).
Could you give any tip hint how to do this?

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