Generalized linear models of the probability of PVY replicative fitness gain during evolution experiment and of PVY final replicative fitness.

A logistic regression was used to analyze the effects of the initial replicative fitness Wi, the effective population size at the onset of systemic infection Ne and their interaction on the probability that a PVY lineage shows a replicative fitness gain. The analysis was conducted on the 64 lineages of the experiment. Linear regression was used to investigate the effects of these same explanatory variables on the final replicative fitness Wf, using the 55 lineages (out of 64) not extinct at the end of the experiment.