Words to Describe covariates

How covariates often is described ("________ covariates")

• spatial
• varying
• quantitative
• qualitative
• metrical
• unmeasured
• stochastic
• scaled
• endogenous
• metric
• latent
• several
• specific
• relevant
• socioeconomic
• correlated
• potential
• environmental
• explanatory
• additional
• invariant
• discrete
• important
• unknown
• variable
• appropriate
• unobserved
• observed
• demographic
• stable
• prespecified
• constant
• fixed
• measured
• meaningful
• dichotomous
• influential
• key
• nonsignificant
• exogenous
• behavioral
• fallible
• available
• following
• associated
• possible
• numerous
• observable
• structural
• categorical
• independent
• continuous
• sociodemographic
• incomplete
• significant
• other
• individual
• random
• dependent
• external
• multiple
• level