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What Do We Call Items Consumers Receive Free of Charge

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What do we call items consumers receive free of charge in return for making a purchase?


Definitions:

Multiple Regression Model

A predictive method in statistics using multiple variables as predictors to estimate the outcome of a response variable.

Multidimensional Space

An abstract mathematical concept, involving more than three dimensions, that can represent complex data structures or physical phenomena.

Mean Squares for Error MSE

A measure used in statistical modeling to quantify the variance of error terms.

Predictor Variables

Variables used in statistical models to predict or estimate the value of an outcome or dependent variable.

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