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Estimation

What is the difference between a parameter and a statistic in the context of estimation?
A parameter is a numerical measure that describes a characteristic of a population, while a statistic is a numerical measure computed from a sample and used to estimate the parameter.
What is a least squares estimator?
Estimator minimizing sum of squared deviations from observed values.
What is point estimation in statistics?
Point estimation is the process of using a single value, called a point estimate, computed from sample data to estimate an unknown population parameter.
What is the difference between an estimator and an estimate?
Estimator is a rule or formula; estimate is its numerical value.
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