The ETF market makers are probably executing arb strategies continuously intraday to keep the ETF aligned with its components. Of course, they will have market maker advantages. So that's tough competition.Quote from Shanb:
I just haven't seen alot of discussion about this on an intraday basis. Factor models used intraday will be alot different than on a longer tf given the difference in market participants that operate on that tf.
Also some nuance may lie in what factors to consider when creating the basket to trade against the ETF. I am noticing that the different Sector ETF's have some different allocation of holdings. While one sector ETF may work well with using the varying industires. Something like the XLE may work better by differentiating according to market cap and industry
There may be a brief opportunity at the session open when overnight gaps throw the ETF/components alignment out of whack until market liquidity and pricing settles down. But I imagine all this transpires in seconds in our electronic markets.
Sorry I don't have any better insights to contribute to your quest. It's an interesting topic which caught my attention.