The exogenous ones, which are set by an outside agent, and the endogenous ones, which occur inside a problem.
So if you look at this formula for a wave in one dimension:
y = exp(-jkx), where k = 2pi / lambda
lambda and x are exogenous while k is endogenous (j and pi are constants).
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Dependent, Idependent and Control
Qualitative and quanitative are two types of variables.
The two types of variables are the CONSTANT and CONTROL.
Measured variable, control variable, treatment variable and moderating variable
Variables change, constants do not.