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.
1 Symptoms include white spots inside the mouth or on the tongue, sore throat and difficulty swallowing.  Canker sores â these are small white or yellow center lesions with a red border. They develop in the mouth on the tongue, inside cheek areas, lips, gum line and throat area. They are not contagious.