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An alternative, but more demanding, way is to engage human experts to annotate a large number of tweets with the expected stock moves, and then construct a machine learning model for prediction. The application of the event study methodology to Twitter mood shows significant correlation to cumulative abnormal returns (Sprenger et al. (2014 ...
The successful prediction of a stock's future price could yield significant profit. The efficient market hypothesis suggests that stock prices reflect all currently available information and any price changes that are not based on newly revealed information thus are inherently unpredictable. Others disagree and those with this viewpoint possess ...
One orca followed as the captors’ boat led Moby Doll by the harpoon line from Saturna Island to Vancouver. [46] Plausibly the same orca exchanged long–distance pulsed calls with him over two miles (3.2 kilometres) the next day when he was at Burrard Dry Dock. [47] In 1967, K Pod orcas were being herded in the Yukon Harbor capture operation ...
Northern resident orcas, also known as northern resident killer whales (NRKW), are one of four separate, non-interbreeding communities of the exclusively fish-eating ecotype of orca in the northeast portion of the North Pacific Ocean.
Old Thom is a large bull orca, and is estimated to be 25 to 30 feet (7.6 to 9.1 m) long, with an estimated weight of 8 short tons (7.3 t). [3] The whale is identified by a distinct notch a third of the way down the posterior side of the dorsal fin.
Port and Starboard are a pair of adult male orcas notable for preying on great white sharks off the coast of South Africa. [1] The duo are identified as having rare and distinct collapsed dorsal fins and they are named for the nautical terms, as Port's fin collapses left and Starboard's collapses right. [2]
In Jaws (1975), the name of the boat used to hunt the great white shark is the Orca, given the killer whale's status as a known predator of the shark. However, in the sequel Jaws 2 , the shark's first victim is a killer whale, which was probably intended more as a Hollywood joke than an accurate portrayal of the eating habits of great white sharks.
The IUCN reported in 2008, "The taxonomy of this genus is clearly in need of review, and it is likely that O. orca will be split into a number of different species or at least subspecies over the next few years." [3] Although large variation in the ecological distinctiveness of different orca groups complicate simple differentiation into types. [4]