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Hi my apologies first, I'm a biologist and not so good in statistics. In my study I'm studying the effect of concentration on growth of a certain specimen. I have with me the different concentrations and the growth data for each concentration. What do you suggest is the best statistical test to find out the best concentration (i.e the one having maximum growth). Thanks in advance.

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Concentration of the specimen or the food source? What is concentration referring to? Also, you might want to ask at CrossValidated, there are statisticians over there, some even work in genetics or other biology fields. –  Raskolnikov Dec 9 '10 at 16:50
Looks like a job for GLM... but yes, asking at CrossValidated would be a good idea. –  J. M. Dec 9 '10 at 17:04
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