|
My opinion is that the IV of thinly traded foreign-based ETFs like SCZ is always very stale and not a useful metric. For heavily traded ETFs like SPY, IWM, EEM, EFA the IV is probably legitimate, but for these ETFs you also don't need it because the bid/ask spread is often less than 1 cent.
So when I am trading a small-cap foreign ETF like DLS or GWX, I generally
(1) Select ETFs with more volume
(2) Trade on a day when the volume is above average and around 100K shares already
(3) Look (i.e. plot) the intraday prices and their action of DLS, GWX along more heavily traded ETFs like EEM, SPY, EFA to make sure that percentage movements are similar.
(4) When buying, purchase the ETF which has dropped the most relative to other similar investments and when selling, sell the ETF which is up the most relative to other similar investments.
(5) Try to use limit orders and to use real-time Level II quotes and plotting to see what the current book and action is.
|