codon usage bias

[Janssens at agr.kuleuven.ac.be]

Hi,

I'm looking for a method to analyse differences in codon usage tables. I know 
the gcg programs codonfrequency, preference and correspond, but what I'm 
looking for is a way to calculate the error-level. I tried it with chi-square, 
but that seems not to be correct. Does anyone know a SAS-program to do this or 
another downloadable algorithm.

Thanks,

Hans Vermeiren
FA Janssens Laboratory for Genetics
W. De Croylaan 42
B-3001 Heverlee
janssens at agr.kuleuven.ac.be