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. 2006 Feb;172(2):1009–1030. doi: 10.1534/genetics.105.045666

TABLE 2.

Statistical tests of homogeneity of yellow mutant and matched-control noncompetitive male mating success

yellow allele Total Na No. of trials % success in experimental flies % success control flies Fisher's exact test P-valuebc Pearson's χ2 d Pearson's P-valuec Mantel- Heanszel chi-squarede Mantel- Heanszel P-valuec Overall male-mating success
y1 120 5 32.9 74.0 8 × 10−6 19.75 < 0.0001 19.58 < 0.0001 −
Df(1)y-ac22 83 4 18.2 76.9 6 × 10−8 28.74 < 0.0001 28.39 < 0.0001 −
y59b 82 3 13.2 79.5 9 × 10−9 35.97 < 0.0001 35.53 < 0.0001 −
y−893 123 4 45.3 58.6 0.10 2.14 0.14 2.12 0.15 +
y2 139 5 51.3 47.6 0.73 0.19 0.66 0.19 0.67 +
y3P 70 2 46.7 50.0 0.49 0.08 0.78 0.08 0.78 +
y−300gin 126 4 46.8 48.4 0.50 0.04 0.85 0.04 0.85 +
ybl 193 6 51.5 49.0 0.69 0.13 0.72 0.13 0.72 +
y−91 64 2 17.6 90.0 7 × 10−6 20.13 < 0.0001 19.81 < 0.0001 −
y3d 174 6 23.5 73.0 4 × 10−11 42.64 < 0.0001 42.32 < 0.0001 −
y2S 335 9 44.9 54.8 0.045 3.25 0.07 3.24 0.07 −
ya77 121 4 29.4 64.3 1 × 10−4 14.35 < 0.0001 14.33 0.0001 −
yintronless 166 5 51.4 52.2 0.52 0.01 0.92 0.01 0.92 +
y+660R 88 2 45.8 55.0 0.26 0.73 0.39 0.73 0.39 +
y+1310 109 5 55.2 47.1 0.85 0.72 0.39 0.71 0.40 +
a

Total N is the sum of the number of experimental and matched-control flies analyzed across all trials.

b

One-sided Fisher's exact tests were performed because we expected a priori that the mating success of mutant males would either not change or be reduced. The P-value is the probability of the exact contingency table or a more extreme one in the same direction.

c

The P-values that are <0.05 are underlined, and P-values <0.10 but >0.05 are in italics.

d

All chi-square tests were performed with 2 × 2 contingency tables and 1 d.f. with a critical chi-square value of 3.841 for a 0.05 significance level.

e

The Mantel-Heanszel chi-square test is frequently used to analyze data tables in which one or more cells have low values. We utilized this as an additional test because low mating success of some y mutants occasionally resulted in low values for “success,” and/or very high mating success of some control males resulted in low values for “failure.”