In "Data Sources" (p. 18) the book tells you that the data are primary (or come from a primary data source) if you collect your own data for analysis, and that the data are secondary (or come from ...

It is not necessary to sort by the values of CAUSE since this is done by the PARETO procedure. The two charts, displayed in Output 29.1.1 and Output 29.1.2, reveal a reduction in oxide defects after ...

The sociologist, therefore, knows exactly how the data was collected, by whom and for what purpose (you don’t, for example, have to trust other people if they collected their data accurately). As we ...