Starbucks Corp (SBUX) shares dropped nearly 16% yesterday following their earnings release for fiscal Q2. Starbucks was already in the Unfavored zone of the SIA S&P 100 Index Report and fell 7 more spots yesterday to the 100th ranking out of 103 investments. Starbucks has been in the Unfavored zone since June of last year and is down around -25% during this time period. SIACharts’ RS rankings can help investors steer clear of earnings misses like Starbucks experienced yesterday.