Application of decision support system with data mining methods in automotive sector in quality control

Today, the automotive sector is the "key" sector for developed and even developing countries. A strong automotive sector is striking as one of the common features of industrialized countries. Production in this sector consists of many processes. One of the most important of these processes is quality control. The measurement data in this area is very large and as the volume of data increases, the rate that people understand is reduced. Variations are the enemy of quality and there is variation in everything. In this thesis study, a decision support system is applied in the quality control process with classification algorithms which are data mining methods. While this work was underway, the Cross Industry Standardized Processing Model (CRISP) was used for data mining. The performance of the results of the classification algorithms in the study was compared with the Cross Validation and Hold-Out methods. With the Hold-Out method, the test and training data set is divided into 40% -60%, 25-75%, 20% -80% discrimination ratios respectively. As a result of the comparison, the models established with the decision tree gave better results than the other models. The best performing C4.5 decision tree algorithm has an accuracy rate of about 0.87. Yet another decision tree, the Random Forest algorithm, has reached a high accuracy rate, but is still out of time performance. These two algorithms are followed by NaiveBayes and SMO algorithms in performance. In this study, an application for quality analysis using data visualization techniques, which is one of the data mining methods, is also included.