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Formation good regression model or suitable for a statistical data principlely was connected with scatter diagram of noticed variable. Application of regression model had two goal namely (1) to predict relationship one free variable or more and one unfree variable or more. (2) to predict value hoped for unfree variable if value of free variable known. In dailylife it was not always constant, so that it was necessary to have the suitable statistical model to data. The regresion studying it was called segmented regression. From scatter diagram could be predicted linier data pattern so that the first probability it could be applied simple linier regression model and second probability it was used linier segmented regression model if there is the difference of special dot pattern. Based on two linier regression model could be chosen the best linier regression model was regression model having the highest R2.]]>
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