I decided I needed to define for myself how Yahoo & I suppose all the performance quoting/charting services must calculate their adjustment techniques. Yahoo will sporadically skip a div adjustment for its nav adjustment quotes but I've long made corrections for the div misses on nav reporting. But the IEP performance measure reporting has revealed a critical mistake on my part about how the measurement services operate. I have not understood that the performance measure services eliminate the div from the calculation on DBX rather than the ex date. In the overwhelming majority of cases this impact is insignificant. But the IEP case was major as the COB quote of IEP tumbled noticably more on ex date than the $2 div and the $2 div was a hefty portion of the corpus as well.

Just setting the #s for myself, IEP closed on DBX at $34.70 and then closed on the ex at $32.22. The $2 div was only 5.764% on DBX while it was a full 6.207% on ex. The impact on its corpus waa significant enough to noticably reduce its performance since SabaKO from a loss of 5.6% to a yahoo performance loss of 6.1%.

Whie that's not going to have any impact on its performance standing in comparing it with other equity index vehicles as it will be at the bottom of course but it will allow me to understand how the measurement services determine performance.