# Omitted variable bias in time series

This is a brief question because my lecturer mentioned it today in class but I don't quite understand. Why is omitted variable bias not a major problem in time series analysis?

• Hi there, when you say time series analysis do you mean an analysis like ARIMA or do you mean something like a regression with a lag factor? – Michelle Mar 2 '12 at 19:23
• I'm actually not sure what you mean... since regression with a lag factor is just a specific case of an ARIMA model (eg ARIMA(p,0,0)), no? – ronan Mar 31 '12 at 10:16