Читать книгу Introduction to Linear Regression Analysis - Douglas C. Montgomery - Страница 22

The parameters β₀ and β₁ are unknown and must be estimated using sample data. Suppose that we have n pairs of data, say (y₁, x₁), (y₂, x₂), …, (yn, xn). As noted in Chapter 1, these data may result either from a controlled experiment designed specifically to collect the data, from an observational study, or from existing historical records (a retrospective study).