![]() Could you detect a meaningful change in your measurement if one arose?.What if you had a colleague take the measurement?.Do you know what kind of variability you would expect to see if you took the same measurement with the same material?.Imagine you took a measurement in your lab-it could be a simple one such as weighing the mass of a material or figuring out the optical density of a solution, or something more complex like determining the number of colonies on a plate using an automated colony counter. The purpose of this article is to introduce you to gage repeatability and reproducibility studies (Gage R&R), which is a hands-on and statistically sound way to build confidence in the accuracy and precision of almost any method in the lab. ![]() With so many factors that can alter or impact the “trueness” of a result (from laboratory technique and environment to instruments), the field of “measurement systems analysis” can become a critical means of trusting one’s data. ![]() ![]() The degree of variability in measurements is arguably just as important as the result itself. Most scientists in the lab trust the measurements they are taking-but how can we know and verify that a measurement or method is truly accurate and reliable? One way is using Gage R&R studies.
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