Math_Statspear.php.netClasses to calculate statistical parametersPackage to calculate statistical parameters of numerical arrays
of data. The data can be in a simple numerical array, or in a
cummulative numerical array. A cummulative array, has the value
as the index and the number of repeats as the value for the
array item, e.g. $data = array(3=>4, 2.3=>5, 1.25=>6, 0.5=>3).
Nulls can be rejected, ignored or handled as zero values.Jesus M. Castagnettojmcastagnettojmcastagnetto@php.netyes2010-10-040.9.10.9.0betabetaPHP
QA release
Bug #17924 frequency and test suite broken
4.21.4.0b10.8.00.8.0stablestable2002-05-15PHP
Initial release
0.8.10.8.1stablestable2002-05-23PHP
Bug fix in __sumdiff() and in __sumabsdev(), which made
the variance, standard deviation, etc. be calculated incorrectly.
0.8.30.8.3stablestable2002-05-23PHP
Another bug fix release. Version 0.8.2 was not released due
to wrong tags and bugs.
0.8.40.8.4stablestable2003-05-16PHP
Fixed problem in element selection for the calculation
of the median. Thanks to Jeff Hoover for finding this bug.
0.8.50.8.5stablestable2003-05-27PHP
Added methods sampleCentralMoment() and sampleRawMoment() to
calculate the corresponding nth moments of the data set.
Explicit casting of parameters passed to pow() to
circumvent the warnings/errors given by some versions
of the PHP interpreter. Thanks to Stephen Evans for
pointing this problem out.
0.9.0beta10.9.0beta1betabeta2003-06-02PHP
This is a beta release that containes new not thoroughly tested methods and
algorithms.
Many changes in the existing methods, and a number of new ones:
- Added better error handling.
- Refactored existing methods to delegate calculations better
- Added value caching for invariant statistical parameters
- Added optional parameters to some existing methods to enhance their
processing or output. Preserve the original behaviour as default so
as not breack backwards compatibility
- Added new methods:
- center()
- studentize()
- range()
- geometricMean()
- harmonicMean()
- product()
- productN()
- percentile()
- quartiles()
- interquartileMean()
- interquartileRange()
- quartileDeviation()
- quartileVariationCoefficient()
- quartileSkewnessCoefficient()
- Added a unit test class based on PEAR::PHPUnit
0.9.0beta20.9.0beta2betabeta2003-06-04PHP
This is a bug fix release. Fixes (finally) an old bug in calculation of the
median. Users of any previous version are recommended to upgrade.
When I fixed a previous bug in the calculation of the median, I forgot to apply
the full fix, so it was calculating an erroneous value for data sets with an
odd number of entries.
Thanks to Diego Puga for pointing this out. It is good to get bug reports
when one is getting old and forgetful. ;-)
0.9.00.9.0betabeta2010-10-04PHP
QA release
Updated svn structure
Unit tests updated to phpunit 3.4
Bug #3315 frequency() generates notices
Bug #6252 Calculation of frequency gives an E_NOTICE
Bug #12465 Median formula incorrect
0.9.10.9.0betabeta2010-10-04PHP
QA release
Bug #17924 frequency and test suite broken