Dear Sebastian,

I had a look at the code and it appears you are using method of moments calculation to get the expected sample variance? Method of moment does not always guarantee an unbiased estimator unfortunately...  I have done similar sort of work for my research as I cannot see any obvious estimators to use. Perhaps a good idea is to use maximum likelihood estimator? I am not sure how to get the distribution of the column sums of your matrix however! Maybe others can comment on this too?


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 Steve Su (s.su@qut.edu.au)    
 Postdoctoral fellow

 School of Accountancy 
 Queensland University of Technology  
 
 Postal Address: Steve Su, School of Accountancy, QUT, PO Box 2434, Brisbane, 
 Queensland, Australia, 4001.   

 Phone:  +61 7 3864 4357
 Fax:    +61 7 3864 1812      
 Mobile: 0421  840  586  
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