Table 2 Details of sign tests used to analyze data in Fig. 6

From: Avian UV vision enhances leaf surface contrasts in forest environments

Null hypotheses tested

Deciduous (N = 95) sign statistic, P-value

Wet schlerophyll (N = 109) sign statistic, P-value

Rainforest (N = 161) sign statistic, P-value

V-contrast−U-contrast = 0

38, 0.06

70, 0.004

122, <0.0001

S(V)-contrast−S(U)-contrast = 0

3, <0.0001

1, <0.0001

12, <0.0001

LMSV−LMSU = 0

19, <0.0001

31, <0.0001

72, 0.2

  1. The sign statistic indicates the number of times the difference in leaf-contrast seen by different channels or combinations of channels (shown in the null hypotheses tested column) was greater than zero
Back to article page