What is the variable that provides the basis for estimator?

The variable that provides the basis for an estimator is typically the sample data collected from a population. This data is used to calculate the estimator, which is a statistical function that aims to estimate a population parameter, such as the mean or variance. The quality and relevance of the sample data directly influence the accuracy and reliability of the estimator. In essence, the sample serves as the foundation upon which estimations about the broader population are built.