Quantitative analyses
For the analysis of data set 1 (play with a target dog), we analyzed only play partner data. As we found a strong positive correlation between the height and weight of the target dog and those partner dogs (N = 27) that did play (r = 0.85, N = 27, P < 0.001),we confine our presented analyses to height. Using weight did not affect the outcomes. We used logistic regression to determine the effect of body size and play bout duration on the probability that rollovers would occur during a bout. In the analysis of the duration of the supine phase of the rollover (hereafter ‘rolloverduration’), where subjects contributed more than one datum to analysis, we ran generalized linear mixed models (GLMM) under restricted maximum likelihood estimation, with rollover durationas the dependent variable and subject identity as the random effect. We conducted all statistical tests using Stata 13 (StataCorp,2013) or JMP 10 (SAS Institute, 2012). Tests were two-tailed, with alpha = 0.05. Again, data from the two data sets were analyzed sep-arately so as to determine whether both converged on the same patterns.
Quantitative analysesFor the analysis of data set 1 (play with a target dog), we analyzed only play partner data. As we found a strong positive correlation between the height and weight of the target dog and those partner dogs (N = 27) that did play (r = 0.85, N = 27, P < 0.001),we confine our presented analyses to height. Using weight did not affect the outcomes. We used logistic regression to determine the effect of body size and play bout duration on the probability that rollovers would occur during a bout. In the analysis of the duration of the supine phase of the rollover (hereafter ‘rolloverduration’), where subjects contributed more than one datum to analysis, we ran generalized linear mixed models (GLMM) under restricted maximum likelihood estimation, with rollover durationas the dependent variable and subject identity as the random effect. We conducted all statistical tests using Stata 13 (StataCorp,2013) or JMP 10 (SAS Institute, 2012). Tests were two-tailed, with alpha = 0.05. Again, data from the two data sets were analyzed sep-arately so as to determine whether both converged on the same patterns.
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