Hip flexor strain occurs from overuse of the muscles that help you flex your. knee or do high kicks. This injury occurs in bicyclist, athletes who jump or. run with high knee kicks, athletes like soccer players, who do forceful. kicking activities, and people who practice, and people who practice the. martial arts.
In statistics , a spurious relationship ( see also spurious correlation and spurious regression ) is a mathematical relationship in which two or more events or variables are not causally related to each other ( i.e. they are independent ) , yet it may be wrongly inferred that they are , due to either coincidence or the presence of a certain third , ...
A confounding variable or factor is also sometimes referred to as a confounder or a lurking variable. It is a hidden variable in a statistical or research model that affects the variables in question but is not known or acknowledged, and thus (potentially) distorts the resulting data. This hidden third variable causes the two measured variables to falsely appear to be in a causal relation.