Regression is one of the most commonly used statistical techniques. However, testing regression systems a great challenge because absence test oracle in general. In this paper, we show that Metamorphic Testing an effective approach to multiple linear systems. doing so, identify intrinsic mathematical properties regression, and then propose 11 Relations be for testing. Their effectiveness examin...

Abstract – Price forecasting is a part of economic decision making. Forecasting the daily rise and fall gold prices can help investors decide when to buy or sell commodity. The price depends on many factors such as other precious metals, crude oil, performance stock exchange, exchange rate currencies. This study discusses using multiple linear regression method. results this indicate that best ...

the acute ecotoxicity of a set of mixture samples (washing powders, wastes, fuel extracts etc.) was assessed using four acute ecotoxicity assays with aquatic organisms (daphnia magna, poecilia reticulata, artemia salina and desmodesmus subspicatus). the experimental concentration-response curves were fitted by seven two-parameter sigmoid equations using non-linear regression. the regression pe...

analytical solutions and type curves for the constant rate radial flow of fluid in both conventional and naturally fractured reservoirs including the effect of wellbore phase redistribution are presented. an automated procedure for non-linear least square minimization using the analytical solutions and their derivatives with respect to the unknown parameters developed to analyze the pressure bu...