Topic: Entropy Information
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What is zero entropy in information theory?
I think zero entropy in information theory is something with no uncertainty or simply determined event. The extreme case is that of a double-headed coin which never comes up tails. Then there is no uncertainty. The entropy is zero: each tos... Read More »
Source: http://answers.yahoo.com/question/index?qid=20100514014427AAEDF25
What happens to entropy if you erase information?
It changes depending on what you erase? Read More »
Source: http://answers.yahoo.com/question/index?qid=20111121055936AAWHZcE
Why does the information entropy equation need logarithm?
log of a number to an exponent is the exponent base the number, multiplying two equal numbers raised to different powers is the number to the sum of the powers so the sum of logs is the same as that, you can omit the log only if all the exp... Read More »
Source: http://answers.yahoo.com/question/index?qid=20080702021914AAU91G8
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It is exactly analogous to the fact that, while a probability cannot exceed 1, a probability density (which is not the same thing as a probability, but rather, a rate of change of probability, in a suitable sense) can and often does exceed ...
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Source: http://www.quora.com/In-information-theory-how-is-it-that-discret...
I assume they mention entropy in the context of building decision trees. To illustrate, imagine the task of learning to classify first-names into male/female groups. That is given a list of names each labeled with either m or f, we want to ...
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Source: http://stackoverflow.com/questions/1859554/what-is-entropy-and-in...
hi Giovanni, there is a good article on wikipedia on this (see the link). The main point (remembering from school...) is that the entropy in information theory is mainly a measure of the average number of bits REQUIRED to send an informatio...
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Source: http://www.linkedin.com/answers/using-linkedin/using-linkedin/ULI...
