If a message announces an event E1 of probability P(E1) its information content is − log2P(E1). This is also its length in bits.
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(2017). Shannon’s Information. In: Sammut, C., Webb, G.I. (eds) Encyclopedia of Machine Learning and Data Mining. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-7687-1_968
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