Hartley's formula

Hartley's formula to determine the amount of information contained in a message with length n.

As Wikipedia tells us, Hartley's formula determines the amount of information contained in a message of length n.

That is, we have an alphabet A of which letters we make up a message:
|A| = m

The number of possible variants of different messages:
N = m^n
where N — the possible number of different messages; m — number of letters in the alphabet; n — the number of letters in a message.

Then the Hartley's formula is defined as:
I = \log_2 N = n \log_2 m,
where I — the amount of information, bits.

The Hartley's formula was proposed by Ralph Hartley in 1928 as one of the scientific approaches for message evaluation.

PLANETCALC, Hartley's formula

Hartley's formula

Amount of information, bits
 

Creative Commons Attribution/Share-Alike License 3.0 (Unported) PLANETCALC, Hartley's formula

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