Table 1.

Fitting a mixture of von Mises distributions to mean heading vectors of flies in a no odor, no wind environment

Modelgof(U2)Pμ1 (degrees)s (degrees)p1μ2 (degrees)s (degrees)p2
1VM0.644<0.011.26±178.3774.511.00---
2VM0.0980.16−2.91±6.5528.300.58177.72±8.8332.450.42
• For each model, a goodness of fit was calculated and significance tested against a parametric bootstrap as described in the Materials and methods. The mean direction of each mode (μ±95%CI) as well as the angular standard deviation (s) and proportion of data fit by that mode (pn) are shown. The fitting of mixtures was stopped when the probability exceeded 10%. P represents the probability that the data are better fit by a model containing the corresponding number of modes than by a model containing additional modes.