In stochastic processes, chaos theory and time series analysis, detrended fluctuation analysis (DFA) is a method for determining the statistical self-affinity of a signal.
Sore throats caused by tonsillitis or streptococcus may trigger a canker sore even after the initial throat condition has subsided. Also known as an aphthous ulcer, canker sores are painful and unsightly, but they are not contagious.
I do get canker sores without sore throats, though I can't recall the last time I've had a sore throat that was followed by canker sores. I usually manage to treat my canker sore all right, but I'm just curious if there's a specific reason why this phenomena happens to me.