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WEİBULL DAĞILIMININ ÖLÇEK VE BİÇİM PARAMETRELERİ İÇİN İSTATİSTİKSEL TAHMİN YÖNTEMLERİNİN KARŞILAŞTIRILMASI

COMPARISON OF STATISTICAL ESTIMATION METHODS FOR THE SCALE AND SHAPE PARAMETERS OF THE WEIBULL DISTRIBUTION

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Abstract (2. Language): 
Weibull probability distribution, which is commonly usedtoday in data analysis in relation with lifetime and failure ratios, mostly includes a logarithmic model with parameters. The parameters of Weibull probability distribution can be predicted through various methods. Out of those methods, the most frequently used ones are graphic method, least squares method, maximum likelihood method and moment method. While a prediction is made through the help of shapes in a totally graphical environment in graphic method, predictions are made by way of employing mathematical equations and statistical functions in other methods. In this study, the methodsused in parameter predictions are briefly covered first. At the end of the study, the parameters of a Weibull probability distribution have been predicted for a data set in respect to the lifetime of a material that is being used as the printing unit of a photocopier through using the said methods and the results ofwhich have been compared respectively.
Abstract (Original Language): 
Günümüzde yaşam süreli veya başarısızlık oranlarıile ilgili veri analizinde yaygın olarak kullanılan Weibull olasılık dağılımı, çoğunlukla iki parametreli logaritmik bir model içermektedir. Weibull olasılık dağılımının parametreleri, farklıyöntemler ile tahmin edilebilir. Buyöntemler içinde en çok kullanılanlar, grafik yöntemi, en küçük kareler yöntemi, maksimumbenzerlik yöntemi ve moment yöntemidir. Grafik yönteminde, tamamen grafik ortamında şekil yardımıyla bir tahmin yapılırken, diğer yöntemlerde matematiksel eşitlikler ve istatistiksel özellikler kullanılarak tahminler yapılmaktadır. Bu çalışmada öncelikle parametre tahmininde kullanılan yöntemlerden kısaca bahsedilmiştir. Çalışmanın sonunda, bir fotokopi makinesinin baskıünitesi olarak kullanılan bir malzemenin ömürleri ile ilgili veri seti için, Weibull olasılık dağılımının parametreleri, bu bahsedilen yöntemler aracılığıile tahmin edilmişve sonuçlar karşılaştırılmıştır.
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