Dear Marco:

Look in "agricolae" package.

There is a Friedman test with and without replicates.

In this package is used the Conover's book as a reference.

Greetings,

Dr. D. José Trujillo Carmona
Dpt. of Mathematics
Fac. of Science of Badajoz
Univ. of Extremadura
Spain



From: Marco Chiarandini 
<machud_at_intellektik.informatik.tu-darmstadt.de 
<mailto:machud_at_intellektik.informatik.tu-darmstadt.de?Subject=Re:%20%5BR%5D%20Friedman%20test%20for%20replicated%20blocked%20data>> 

Date: Tue 14 Dec 2004 - 04:20:51 EST


Hi,

I would need to extend the Friedman test to a replicated design. 
Currently the function: friedman.test(y, ...) only works for 
unreplicated designs.

I found in Conover 1999 "Practical Nonparamteric statistics" an 
extension of the formula to my case.

Nevertheless, other sources, like Sheskin 2000 "Parametric and 
Nonparametric statistical Procedures" and Daniel 1990 "Applied 
nonparametric statistics" give a different formula from that of Conover 
in the unreplicated case. Since they do not provide the extension of 
this formula to the replicated case I would like to know if someone 
could give me a reference where I could find such extension. The formula 
is indeed very simple:

F= z \sqrt{bk(k+1)/6}

where z is a quantile from the normal distribution, b the number of 
blocks and k the number of treatments.

Unfortunately, the sources cited do not provide indications from where 
the formula comes from.

Thank you for consideration,

Greetings,

Marco

------------------------------------------------------------------------

Marco Chiarandini,
Technische Universitaet Darmstadt

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