Evaluating precision and repeatability of hand calipers

Abstract

Often, statistical evaluations of metric data are overlooked in ceramic studies. This paper evaluates degrees of precision and repeatability through the application of a coefficient of variation analysis and a repeated measures ANOVA. First, the author assessed the use of calipers for measuring metric data that pertains to decorative elements. Second, the author assessed the degree of statistical difference between measurements taken and measurements that have been rounded, a technique used to account for intra-observer error. The results demonstrate that the precision and repeatability of calipers is suitable for effectively measuring metric data values, and the precision of non-rounded values does not differ greatly from rounded values. The author argues that calipers are an effective metric measuring aid that further contribute to studies of personal actions and thought processes of potters. As a result, archaeological focus can integrate a micro-scale understanding of potting communities to consider finding individual variation and the learning landscapes of inexperienced potters.