![]() Many professionals believe that a scatter diagram is like a fishbone diagram because the latter includes two parameters: cause and effect. ![]() In that case, you can use any axis for any variable. There can also be two independent variables. It is not necessary to have a controlling parameter to draw a scatter diagram. ![]() The independent variable operates as the control parameter because it influences the behavior of the dependent variable. In most cases, the independent variable is plotted along the horizontal (x-axis), and the dependent variable is plotted on the vertical (y-axis). This reveals the correlation between the two. Once the drawing is complete, you notice that the number of accidents increases as the speed of vehicles increases. You select the two variables, motor speed and the number of accidents, and draw up the diagram. You are analyzing accident patterns on a highway. ![]() Scatter diagrams can show a relationship between elements of a process, environment, or activity on one axis and a quality defect on the other axis.” Example of Using a Scatter Diagram After determining how they are related, you can predict the behavior of the dependent variable based on the independent variable.Ī scatter plot is useful when one variable is measurable while the other is not.ĭefinition: According to the PMBOK Guide, a scatter diagram is “a graph that shows the relationship between two variables. The scatter diagram is considered the simplest way to study the correlation between these two variables. ![]()
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