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Durbin 1.0
File ID: 84629






Durbin 1.0
Download Durbin 1.0http://www.mathworks.comReport Error Link
License: Shareware
File Size: 10.0 KB
Downloads: 2
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Durbin 1.0 Description
Description: In the analysis of designed experiments, the Friedman test is the most common non-parametric test for complete block designs. The Durbin test is a nonparametric test for balanced incomplete designs that reduces to the Friedman test in the case of a complete block design.
In a randomized block design, k treatments are applied to b blocks. In a complete block design, every treatment is run for every block. For some experiments, it may not be realistic to run all treatments in all blocks, so one may need to run an incomplete block design. In this case, it is strongly recommended to run a balanced incomplete design. A balanced incomplete
block design has the following properties:
1. Every block contains k experimental units.
2. Every treatment appears in r blocks.
3. Every treatment appears with every other treatment an equal number of times.

The Durbin test is based on the following assumptions:
1. The b blocks are mutually independent. That means the results within one block do not affect the results within other blocks.
2. The data can be meaningfully ranked (i.e., the data have at least an ordinal scale).

Syntax: durbin(x,alpha)

Inputs:
x (mandatory) - data matrix (read lower for the correct input)
alpha (optional) - significance level (default = 0.05).

Outputs:
T1 statistic and chi square approximation
T2 statistic and F approximation
Multiple Comparisons (eventually)
T1 was the original statistic proposed by James Durbin, which would have an approximate null distribution of chi-square.
The T2 statistic has slightly more accurate critical regions, so it is now the preferred statistic. The T2 statistic is the two-way analysis of variance statistic computed on the ranks R(Xij).

License: Shareware

Related: significance, optional, Alpha, Input, Level, default, Square, Statistic, outputs, correct

O/S:BSD, Linux, Solaris, Mac OS X

File Size: 10.0 KB

Downloads: 2



More Similar Code

The Friedman test is a non-parametric statistical test developed by the U.S. economist Milton Friedman. Similar to the parametric repeated measures ANOVA, it is used to detect differences in treatments across multiple test attempts. The procedure involves ranking each row (or block) together, then considering the values of ranks by columns. Applicable to complete block designs, it is thus a special case of the Durbin test. The Friedman test is...

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