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Granger (causal) analyses of relative TIS and contact during cold challenge.

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posted on 2014-01-31, 02:43 authored by Christopher Harshaw, Jay J. Culligan, Jeffrey R. Alberts

The results of Granger analyses on relative TIS (TISrel) and contact with males and females. Asterisks indicate significant Granger causality, evaluated at α = .05/6 = .0083. Non-significant results (p<.05) are also shown to depict trends in the data. Arrows indicate that a change in one variable at time tn predicts a change in another variable at tn+lag. For example, in all but the Female Lag 0 models, TISrel is a stronger predictor of contacts with females than the reverse. Arrows in both directions indicate a feedback relationship between the two variables [65]; for example, our results indicate negative feedback between female TISrel and female contacts with males and positive feedback between the male TISrel and male contacts with females. The coloration of arrows indicates significant lagged Pearson product moment correlations between the two variables (p<.001), with positive and negative correlations indicated by green and red, respectively. Tests between TISrel and total contacts were run, but are not shown given that none were statistically significant. Models for Lag 3 were constructed but are not shown. For females, the model was null (no significant Granger causality detected), whereas for males the only significant effect was that male TISrel Granger caused male contacts with males (F = 4.94, p<.003).