Given the predominance of Attic-Ionic Greek in classical Greek literature, the dialect has long been treated as representative of the language as a whole. However, epigraphic evidence depicts a more varied landscape throughout the wider Hellenic world. Modern statistical and quantitative methods enable the dialectologist to not only survey large amounts of epigraphical data but to quantify their confidence in their results. In this initial survey, the author demonstrates a programmatic method for the development and management of an inscriptional data set, and applies that set to the study of two isoglosses in Central Greece between the 4th and 2nd centuries BCE. The author shows that the οι/υ and η/α isoglosses remained largely stable during the period of interest.