10 October 2011 3 3K Report

Question:

The freedom degree (df) number should be 1 or 2? when we analysis the distribution of certain gene's genotypes frequencies between case and control group by Chi2 test. As the following table:

genotype frequency

AA AB BB

case 201 335 45

control 230 321 30

chi-square was 5.25, and the p value=0.0725 given df=2. But the p value will

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