Words to Describe regressors

How regressors often is described ("________ regressors")

• extra
• varying
• irrelevant
• macro
• original
• seasonal
• alternative
• nonconstant
• qualitative
• dummy
• stochastic
• endogenous
• many
• superfluous
• hand
• several
• relevant
• correlated
• integrated
• insignificant
• more
• potential
• deterministic
• contemporaneous
• explanatory
• additional
• fewer
• stationary
• invariant
• nonstationary
• discrete
• suitable
• variable
• identical
• observed
• nonrandom
• corresponding
• generated
• collinear
• fixed
• linear
• predetermined
• key
• stage
• separate
• exogenous
• side
• actual
• orthogonal
• standardized
• included
• micro
• available
• possible
• categorical
• independent
• continuous
• nonlinear
• weak
• dynamic
• significant
• other
• individual
• redundant
• canonical
• random
• dependent
• multiple
• level