Γραφικές μέθοδοι παρουσίασης πολυδιάστατων δεδομένων
Ράτσης, Κωνσταντίνος Ρ.
SubjectΗλεκτρονική επεξεργασία δεδομένων -- Στατιστική ανάλυση ; Ηλεκτρονικοί υπολογιστές -- Γραφικά ; Multidimensional scaling -- Graphic methods
In our era, the need for studying and making beneficial use of increasingly larger amounts of data with complex structure and multiple characteristics (variables) under study is very frequently encountered. The rapid development of the contemporary computers and the flexible features they are offering nowadays for data processing and graphing, made it possible powerful software to be set up for the statistical analysis of enormous data sets; as a result understanding the data structure and revealing the possible interrelations between the population members and the characteristics under analysis, can be easily achieved. One of the major needs that arise when considering data sets with many variables, is the use of appropriate visualization procedures. In the international literature, several methods and techniques have been proposed to gain (usually two dimensional) graphic representation of multidimensional data, particularly during the period 1970-1990. The present MSc thesis offers a systematic presentation of multidimensional data visualization methods and reports the main advantages and disadvantages of each of them. Finally the available software for implementing these techniques is referenced and some illustrative examples are worked out so that the reader gets a better understanding of the way the method is applied in a specific dataset.