Can someone provide me a reference concerning the effect of data heterogeneity on the performance of the Autoregressive model?

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Ette Etuk

Autoregressive (AR) modelling is based on assumption of stationarity which implies homoscedasticity and constant mean. Heteroscedasticity makes AR modelling unreliable for forecasting. To study the sensitivity of AR modelling to heteroscedasticity can best be done by simulation.

Adriana Santos-Caballero

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5333294/

Sharing link

Regards!

Ayman Amin

It is good if you have access to this book:

http://www.springer.com/gp/book/9783319524511