R help - Oct 2009 - the number of components of the mixture model and the stratfied data

Hi,all

    with my data,there are more than 1000 quantitative results of antibody
concentrations, there may be 2 components(positive and negative), or 3
components (may be strong positive, positive, and negative), or 4-6
components. Could you tell me how to determine the number of components of
the mixture model? the  "anova.mix" in mixdist of the R software seems
not
work. 
 
    my data is a little complicated(TABLE ), there are more than 1000
quantitative results of antibody concentrations stratified by age.The
overall density of results at age j, Fj, is a mixture of the component
densities, so if there are 5 age groups, then there will be 5 mixture
models. Do i have to analyse each stratum respectively?
 
TABLE
------------------------
age  Bin   length   freq  
------------------------
    1     1     19.75     4         
    1     2     21.75    10           
             ????
    1    12    41.75    36           
             ???? 
------------------------
    2     1     19.75     4       
    2     2     21.75    10            
             ????
   2    12    41.75    36   
             ???? 
 -----------------------

appreciated

lybao
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