FYI: When there’s no good answer to a basic question, it’s time to ask for a better one.
Investors and ETF asset managers want to know how an ETF performed over the past week, month or year. Often, they want to compare ETF performance, to see how their fund did versus its competition. They might also want to measure tracking difference or end-of-day premium/discount levels.
Often, all they get is frustrated. Shockingly, it is nearly impossible to make a fair, apples-to-apples comparison within an ETF market segment.
Regards,
Ted
https://www.etf.com/sections/features-and-news/wild-west-etf-performance?nopaging=1