Our bathroom scale is now perfectly reliable. Every time you step on it, it reads exactly 160 lbs. Consistent? Yes. But what if you are actually 130 lbs? The scale is reliably measuring something —perhaps a broken spring—but it is not measuring your weight. It is valid for nothing.
But how do we know if our psychological ruler is any good? Furr anchors the entire discipline on two fundamental pillars: and validity . psychometrics an introduction furr pdf
In the end, psychometrics is not just about statistics. As Furr teaches, it is about building trust. Every time a clinician diagnoses a disorder, a company hires a candidate, or a researcher publishes a finding, they are betting on the reliability and validity of their measures. The psychometrician’s job is to make sure that bet is a safe one. Our bathroom scale is now perfectly reliable
