55
edits
Changes
Jump to navigation
Jump to search
Line 220:
Line 220: − +
Significance of E. Coli Evolution Experiments (view source)
Revision as of 14:53, March 14, 2009
, 14:53, March 14, 2009→Comparison of p-Values: Chi-squared test unreliable.
==Comparison of p-Values==
==Comparison of p-Values==
The following table compares the p-values reported in Table 2 of Blount et al. to the chi-square p-values for the same experiments. For experiments one and three, the chi-square p-values are much larger than the "mean generation" test p-values from the paper.
The following table compares the p-values reported in Table 2 of Blount et al. to the chi-square p-values for the same experiments. For experiments one and three, the chi-square p-values are much larger than the "mean generation" test p-values from the paper. This is because the small expected number of mutants causes the chi-squared test to be conservative, meaning that the null hypothesis may be accepted when in fact it ought to be rejected. The chi-squared test is unreliable in this situation.
{|class="wikitable" style="text-align:center"
{|class="wikitable" style="text-align:center"