Reliability: Measurement’s Middle Child

Validity. Reliability. Fairness. Reliability is one of the big three foundations of educational measurement and testing. It’s right up there with a chapter of its own in the Part 1 of the joint Standards along with Validity and Fairness. We’re supposed to love and respect them all the same. But we all know that ReliabilityContinue reading “Reliability: Measurement’s Middle Child”

Vive La Variance!

To educate is to change. Instruction and learning are about change. Educational measurement is defined by variance. Literally. The fundamental concepts in the field are expressed in terms of variance. One of the first techniques that we learn as eager young graduate students is analysis of variance. Without variance, our lives as psychometricians, much likeContinue reading “Vive La Variance!”

Adrift at “C” with IRT

For the past three decades we have weathered the storm of test-based accountability in a skiff called IRT. Buttressed only with a few psychometric tools, loosely defined unidimensional latent constructs, and the promise of measurement invariance we have been buffeted by wind and waves, sometimes taking on water, sometimes finding ourselves run aground in shallowContinue reading “Adrift at “C” with IRT”

Another Term Bites The Dust

Florida Man Steals $33,000 Worth of Rare Coins, Cashes Them in for $29.30 Florida Man Fire Bombs Garage That Impounded His Car, Hits His Own Vehicle Florida Man Bastardizes The Term Progress Monitoring We have come to expect, even look forward to, the zany “news” stories that begin with the two-word phrase, “Florida Man.” AtContinue reading “Another Term Bites The Dust”

A Changing Nation, A Changing Framework

The US Census and NAEP, two of my favorite topics to write about, have been in the news recently because of changes. Last week, data from the 2020 Census was released summarizing changes to the racial/ethnic makeup of the United States across the last several Census counts. Earlier this month, NAEP also made news, albeitContinue reading “A Changing Nation, A Changing Framework”