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22 lines
1.2 KiB
Plaintext
22 lines
1.2 KiB
Plaintext
This module provides basic functions used in descriptive statistics. It
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borrows very heavily from Statistics::Descriptive::Full (which is included
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with Statistics::Descriptive) with one major difference. This module is
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optimized for discretized data e.g. data from an A/D conversion that has a
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discrete set of possible values. E.g. if your data is produced by an 8 bit
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A/D then you'd have only 256 possible values in your data set. Even though
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you might have a million data points, you'd only have 256 different values
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in those million points. Instead of storing the entire data set as
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Statistics::Descriptive does, this module only stores the values it's seen
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and the number of times it's seen each value.
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For very large data sets, this storage method results in significant speed
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and memory improvements. In a test case with 2.6 million data points from
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a real world application, Statistics::Descriptive::Discrete took 40
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seconds to calculate a set of statistics instead of the 561 seconds
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required by Statistics::Descriptive::Full. It also required only 4MB of
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RAM instead of the 400MB used by Statistics::Descriptive::Full for the
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same data set.
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WWW: http://search.cpan.org/dist/Statistics-Descriptive-Discrete
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Author: Rhet Turnbull <rhettbull@hotmail.com>
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