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Apparently of mid-20th century coinage from Latin aestimandum, gerundive of aestimo ‎(I value", "I estimate).


estimand ‎(plural estimands)

  1. (statistics) that which is being estimated.
    • 1939, CF Roos; V von Szeliski, “The Concept of Demand and Price Elasticity--The Dynamics of Automobile Demand”, Journal of the American Statistical Association: 
      Statistics needs a term like estimand to replace the ...
    • 1968, Frederick Mosteller; John W. Tukey, “Data Analysis--Including Statistics”, in Handbook of Social Psychology: Research Methods, page 106:
      We speak of the estimator's target as an estimand (as something to be estimated) rather than just as a parameter.