The methods of the statistics are not truly traditional, but at the same time not so innovative for the archaeological studies. They are amongst a body of largely applied interdisciplinary approaches that have been used in the processing of prehistoric finds, i.e. pottery and flint, stone or bone tools. Moreover, a research of this kind cannot be accepted as complete and really efficient unless it contains such methodology.

The statistical investigation of the architecture requires the formation of a huge in scope database. The process, however, is hindered by many objective and subjective causes. A crucial issue is the fact that most of the Copper age settlements are not fully dug and only few of them are with completely excavated building layers. Another reason is that even when the before-mentioned is not at stake, the gathered information remains poorly published, i.e. lacking stratigraphic sequence, descriptions, graphic and photographic documentation, or even unpublished. These factors impede the differentiation of certain types of Chalcolithic dwellings and their statistical processing.

This study utilises the statistical approach to analyse the Chalcolithic architecture in Northeast Bulgaria, where most of the settlement mounds have been excavated at a large size. The area includes entirely dug mounds and fully exposed building layers – Vinitsa, Golyamo Delchevo, Ovcharovo, Omurtag, Polyanitsa, Radingrad, Ruse and Targovishte. They cover a significant chronological span – from the beginning till the end of the Copper age, which gives the chance to trace the characteristics and the development of the building techniques, the shape, size and dimensions of the houses, their inner plan and arrangement.