Forbes contributors publish independent expert analyses and insights. I research ad fraud and digital marketing. Many marketers think they’ve got ad fraud solved, not only because the Association of ...

More than one correlation coefficient can be computed between two variables when the data can be organized into subsets determined by one or more grouping factors. This paper discusses the ...

Those of us in the business of psychological measurement use the terms reliability and validity a lot. You've probably seen those terms on the Psychology Today website (they appear thousands of times) ...