Is a Single Item Enough to Measure a Construct

Validity

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How satisfied are you with your life? How happy are you with your job or your marriage? Are you extroverted or introverted? It’s hard to capture the fickle nature of attitudes and constructs in any measure. It can be particularly hard to do that with just one question or item. Consequently, psychology, education, marketing, and user experience have a long history of recommending multiple items

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It’s the only number a company needs to grow. Or at least that’s what was proclaimed in the title of the now famous HBR article that helped popularize the Net Promoter Score (NPS). Lately it's been taking on more criticism. The NPS is compelling to executives because of its simplicity and for what it purports to do: be the one number a company should track

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You don't need to be a data scientist, database admin, or statistical maven to conduct quantitative research. You must, however, have a good grounding in some fundamental concepts to make the most of the efforts. While there are a number of skills, techniques, and concepts you'll want to be familiar with, I think it's essential to master these five: reliability, validity, statistical significance, experimental validity,

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You often hear that research results are not "valid" or "reliable." Like many scientific terms that have made it into our vernacular, these terms are often used interchangeably. In fact, validity and reliability have different meanings with different implications for researchers. Validity refers to how well the results of a study measure what they are intended to measure. Contrast that with reliability, which means consistent

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