Words to Describe estimators

How estimators often is described ("________ estimators")

• interval
• step
• alternative
• simple
• simultaneous
• type
• various
• sequential
• empirical
• several
• square
• econometric
• pooled
• consistent
• cost
• improved
• admissible
• class
• squares
• instrumental
• experienced
• multivariate
• conventional
• classical
• ordinary
• biased
• variable
• reliable
• appropriate
• sufficient
• maximum
• precise
• professional
• accurate
• corresponding
• based
• above
• better
• usual
• weighted
• parametric
• mean
• inefficient
• best
• minimum
• linear
• indirect
• adaptive
• stage
• feasible
• nonparametric
• unbiased
• conditional
• least
• related
• robust
• statistical
• following
• possible
• independent
• nonlinear
• optimal
• different
• dynamic
• efficient
• quadratic
• inconsistent
• standard
• random
• recursive
• generalized