May 12, 2016

Giving meaning to test scores

By Catherine Close, PhD, Psychometrician Test scores are of much interest to parents and educators. We all want our children to achieve their best—so, we frequently use tests to measure what a student has learned and can do as a […]
October 15, 2015

What educators need to know about measurement error

By Catherine Close, PhD, Psychometrician   At my first introduction to measurement error, the word error gave me pause, and I silently wondered what good could possibly come from it. To most of us, an error usually means something is […]
April 2, 2015

What educators need to know about validity

By Catherine Close, PhD, Psychometrician In this post, we take a closer look at validity. In the past we’ve noted that test scores can be reliable (consistent) without being valid, which is why validity ultimately takes center stage. We will still […]
August 21, 2014

The basics of test score reliability for educators

By Catherine Close, PhD, Psychometrician   Reliability is a broad topic, broad enough to be thesis worthy. So, when I set out to summarize “all things reliability”—in two pages, no less—I didn’t know where to start. Naturally, I procrastinated. When […]