Introducing a Third Variable - Summary
Introducing a Third Variable - Summary
In Chapter 13, we introduced measures of association between two variables, which can provide evidence of causal relationships. The task for the analyst in a descriptive study is to exert the mental effort required to employ theory, common sense, and data analysis to explore competing explanations for associations. This chapter explores four explanations that become pnssi-ble when a third variable is introduced.
The first, termed spurjous association,involves the possibility that
two variables—such as advertising and intention—-are both caused by a third variable, usage. Spurious association can be detected by developing association measures for subgroups defined by the spurious variable (i. e., users and nonusers). The problem is to identify the spurious variable.
In Chapter 13, we introduced measures of association between two variables, which can provide evidence of causal relationships. The task for the analyst in a descriptive study is to exert the mental effort required to employ theory, common sense, and data analysis to explore competing explanations for associations. This chapter explores four explanations that become pnssi-ble when a third variable is introduced.
The first, termed spurjous association,involves the possibility that
two variables—such as advertising and intention—-are both caused by a third variable, usage. Spurious association can be detected by developing association measures for subgroups defined by the spurious variable (i. e., users and nonusers). The problem is to identify the spurious variable.
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