Question: There are important applications in which, due to known scientific constraints, the regression line must go through the origin (i.e., the intercept must be zero).

There are important applications in which, due to known scientific constraints, the regression line must go through the origin (i.e., the intercept must be zero). In other words, the model should read Yi = β1xi + i, i = 1, 2, . . . , n, and only a simple parameter requires estimation. The model is often called the regression through the origin model.

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