outcome variable

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• confounding variable

  Confounding variable is a variable that, though not measured, causes variation in both the explanatory variable and the outcome variable; also know as a "lurking variable" or a "third variable".

• explanatory variable

  Explanatory variable is a variable we use to explain variation in an outcome variable.

• categorical variable

  Categorical variable is a variable for which the values don’t tell us anything about quantity; the values simply tell us which category the object belongs to.

• path diagram

  Path diagram is, by convention, the explanatory variable "points to" the outcome variable.

• explain variation

  When we can make a better prediction of the outcome variable if we knew something about the explanatory variable; accounting for variation in the outcome variable by using variation in another variable.