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132655 https://hdl.handle.net/2286/R.I.52700 http://rightsstatements.org/vocab/InC/1.0/ 2019-05 35 pages eng Johanson, Jena Mancenido, Michelle Broatch, Jennifer School of International Letters and Cultures School of Mathematical and Natural Sciences Barrett, The Honors College Text Gage reproducibility and repeatability methods do not account for a mix of random and fixed effects, nested factors, and repeated measures. Using a case study in fingerprint analysis, we propose a new method using linear mixed effects models to determine the decomposition of the variation components in a measurement system. The fingerprint analysis tests whether the measuring system for ridge widths is reproducible and repeatable. Using the new model and traditional measurement systems analysis metrics, we found that the current process to measure ridge widths is not adequate. Further, we discovered that it is possible to use a linear mixed model to decompose the variance of a measurement system. Reproducibility and Repeatability Nested Factors Mixed Effects Model Fingerprint Aging Measurement Analysis Reproducibility and Repeatability Experiment with Nested Factors in Fingerprint Age Analysis