The correlation diagram is a simple correlation analysis. Using the form of statistical graphs, the simple calculation method is used to analyze the relationship between the influencing factors and the quality characteristics and the degree of correlation, so that the causal characteristics are represented by the abscissa. The ordinate represents the characteristic of the result, and the related points are scattered like a seed, so the related picture is called a scatter diagram, see the figure below. From a number of scattered points, you can find an optimal straight line, that is, a regression line, so that the characteristics of the ordinate result can be controlled by the causality of the abscissa .
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