Is Quasi Periodic Really Periodic?

"Our work is essentially a way to deal with multiple seasonalities in a pretty robust way that allows for long term, stable forecasts," he says. "We can go very far into the future and be reasonably good, but we can't go short term into thefuture and be very good." He adds: 'I come at itike a little bit of scepticism, isn't the world a dynamic place?'