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cole0jte5ad
Wysłany: Czw 9:35, 07 Kwi 2011
Temat postu: Coach Satchel Bag Benford's Law Coach Crossbody Ba
To make matters even stranger, mathematicians studying this phenomenon since the time of Benford have discovered that this pattern continues to hold true even if the units of measurement are changed (feet changed to yards
Coach Crossbody Bags
, yards changed to kilometers, pounds changed to ounces, etc…) or even if the
bases
are changed entirely (a base is the fundamental unit of counting or measurement – the decimal system uses base 10 while the standard system used in America generally uses a base of 12 – other bases such as 6 and 16 also exist).
Now, take all of these numbers and sort them by their
leading digit
(that is, the number that comes first).
Benford’s Law does not fall easily into either category. It is not exactly a pointless exercise, and it is not exactly an entirely useful, groundbreaking achievement. It
is
interesting, though, and while it may be difficult to find real world applications for it, they certainly do exist.
Benford’s law, discovered by American physicist Frank Benford in 1938 (though the phenomenon in question had been noticed as early as 1881 by Astronomer Simon Newcomb) begins with an examination of the frequency of certain numbers and comes to some rather odd conclusions. Think about it this way:
The frequency of leading digits inexplicably proceeds in perfect numerical order from 1 to 9, despite the logic that would insist that there should be some sort of even distribution.
Read on
Ludwig Boltzmann's Statistics
Statistical Power Analysis
True to Science Sci-Fi: Pocket Universes
Formulation of the Law
Mathematicians have even discovered equations which describe this phenomenon using
logarithms
(a calculus tool in which certain base numbers are raised exponentially). While explanation behind this phenomenon is not exactly a simpl
There are aspects of math which are truly important and lead to outstanding breakthroughs in science, engineering or other areas of thought. Then there are the aspects of math which are simply interesting, even if they might not be important in the long run.
According to standard probability theory (the basics of which are really not so difficult to understand), each of the nine digits (excluding zero, which is generally never used as a leading digit) should occur with relatively equivalent frequency. That is
coach diaper
, they should each appear roughly eleven percent of the time. The results would probably vary slightly, but the larger sample one takes
Coach Satchel Bag
, the more one would expect the numbers to arrive at their most probable locations in the distribution of probabilities. However, the crux of Benford’s law is the fact that this is not at all what happens, no matter how large the sample size.
Further Examination
In actuality (and after having analyzed quite the volume of data), in situations such as this, there is no even distribution of leading digits. In fact, Benford’s law states that the number 1 occurs more frequently than any other number – making up nearly a third of all leading digits! Number 2 is far behind in second place, occurring only 17.6% of the time, then number 3 with 12.5% and so on, all the way to number 9, occurring only 4.6% of the time.
Imagine spending an entire day cataloguing every available number which has some sort of real world representation (meaning that they can’t just be random, made-up numbers – they actually have to have some sort of meaning). This means street addresses, phone numbers, social security numbers, heights of various trees, lengths of rivers, numbers of gumballs in a jar, populations of various towns and cities, mathematical constants etc… the possible source of numbers is practically limitless.
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