Decision making using incomplete data

Decision-making often relies on relevant information extracted from data. To obtain such information, many data analysis techniques can be applied, including statistical analysis, clustering algorithms and modeling techniques using neural nets or machine learning. Unfortunately, in practice, missing data is common and most analysis techniques are not applicable to incomplete data. This paper investigates an approach to handling missing data, using heuristics, in a machine learning system, SORCER. We applied SORCER to decide if certain characteristics of COLIA1 gene mutations are or are not associated with fatal type of, OI (osteogenesis imperfecta), a genetic disease. We compare the accuracies of SORCER´s decisions with a high performing machine learning system, See5 with different percentages of missing data. The results show that average accuracies obtained from See5 tend to decline as the degree of incompleteness increases at a greater rate than those obtained from SORCER