# Questions tagged [estimators]

A rule for calculating an estimate of a given quantity based on observed data [Wikipedia].

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### Given that some statistics are estimators, are test-statistics consistent, efficient, complete and unbiased, estimators?

Given that some statistics are estimators, are test-statistics consistent, efficient, complete and unbiased, estimators? Are sufficient statistics consistent, efficient, complete and unbiased, ...
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### What is the definition of a non-linear estimator? I heard that ratio of estimators is non-linear

Why don't we consider nonlinear estimators for the parameters of linear regression models? says that LASSO is a non-linear estimator. I think LASSO has a solution via matrix multiplication. I don'...
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### Are "Moments" More Robust Then "MLE"?

I am an MBA Student taking courses in Statistics. We are learning about different ways to estimate the parameters (i.e. coefficients) of a Regression Model. Our professor indicated that there are two ...