the act or an instance of declining or moving backwards regressing; esp a retrograde movement
a trend or shift towards a lower, less perfect, or earlier state or condition
reversion to an earlier mental or behavioural level, esp to patterns of thought and behaviour typical of childhood or to a supposed previous life
the statistical analysis of the association between two or more correlated variables, esp so that predictions, e.g. of sales over a future period of time, can be made