New psychological instruments must be tested for incremental validity beyond established measures

Evidence

The purpose of Study 3 was to examine the incremental validity of the IS. Because the IS is a new psychological instrument, it is important to evaluate its ability to predict an outcome over and above other established measures (Hunsley & Meyer, 2003; Piedmont, 2005). For this study, state sympathy was examined as the criterion because, like fear, this emotion plays a prominent role in intergroup relations (Wispé, 1991). — Sherman A. Lee, Chelsea A. Reid, Stephen D. Short, Jeffrey A. Gibbons, Ruth Yeh, and Matthew L. Campbell, Fear of Muslims, 116

Categorization

• DEFINE: Incremental validity is defined here operationally: a new instrument’s ability to predict an outcome over and above existing measures.
• XREF: connects to: New partisan-identity scales can be built via a seven-step validation protocol. — Sabrina J. Mayer and Luana Russo, What one is not: a new scale to measure…, 35