Читать книгу Introduction to Linear Regression Analysis - Douglas C. Montgomery - Страница 13

An essential aspect of regression analysis is data collection. Any regression analysis is only as good as the data on which it is based. Three basic methods for collecting data are as follows:

 A retrospective study based on historical data

 An observational study

 A designed experiment

A good data collection scheme can ensure a simplified and a generally more applicable model. A poor data collection scheme can result in serious problems for the analysis and its interpretation. The following example illustrates these three methods.