The week after we published the Best10 and Best10+ portfolio management system the providers of the Portfolio Simulations corrected their software. The reason for the correction is discussed on their site in their forum. On April 29, 2013 a user reported
Marco, in this port: "SP500 Market Timing Model - 60 Stock - 60-40 New" I had trades show up today from last week (4/22) that were not there last week. One was to sell WNR and the other was a buy of AEO. This port had no suggested trades last week. I always run the rebalances after 8:30 am EST. What is going on?
The problem was identified to short interest rate a component of the ranking system and explained by the following post on the same dayfrom the platform owners
Here is the response from S&P
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