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Package two-factorial-anova
Short Description Analysis of Variance with 2 independent variables (balanced, with interaction)
License MIT
Informations about the package two-factorial-anova
Classic two-factorial ANOVA (With Replication)
This package is used to output simple 2 factor ANOVA (Analysis of Variables) parameters using PHP. (AKA: Two-Way ANOVA, Two-Way Crossed ANOVA)
Installation
Add the ANOVA package as a dependency to your composer.json file:
Usage
Initialize the factorial array for processing as follows: NOTE: Order in which data is passed in is important
*+-------------+------------------+-----------------------+
*| | 1st Factor |
*| | 1 | 2 |
*| | | |
*+--------------------------------------------------------+
*| | | |
*| | 1 | 4 |
*| 2 A | 2 | 5 |
*| n | 3 | 6 |
*| d | | |
*| | | |
*|--F----------+------------------------------------------+
*| a | | |
*| c | | |
*| t | 7 | 10 |
*| o B | 8 | 11 |
*| r | 9 | 12 |
*| | | |
*+-------------+------------------+-----------------------+
The above example is converting a 12 element array into a 2*2 factorial array containing 3 elements in each cell. The first parameter to the constructor is the input array and the second parameter is the number of replications (defaults to 3)
The various ANOVA parameters can then be calculated as follows:
Reference
NIST/SEMATECH e-Handbook of Statistical Methods, http://www.itl.nist.gov/div898/handbook/ppc/section2/ppc232.htm, 5/4/2015.
I acknowledge with thanks, input from Dr. Ying Zhang, Ph.D Professor & Director of Education Department of Biostatistics IU Fairbanks School of Public Health and IU School of Medicine