![]() ![]() This diagram is known as the “Scatter Diagram with Zero Degree of Correlation.”Īs the value of X increases, the value of Y will decrease, but the pattern is not clear. Scatter Diagram with Strong Correlation.Scatter Diagram with Moderate Correlation.These are the most common in project management.ĭepending on the correlation, you can divide scatter diagrams into the following categories: I will discuss the two most popular based on correlation and slope of the trend. You can classify scatter diagrams in many ways. For example, you can use the fishbone diagram to find the two variables (cause and effect) and then use the scatter diagram to analyze their relationship. However, the fishbone or Ishikawa diagram can help you draw a scatter diagram. The scatter plot helps you analyze the correlation between the two variables. The fishbone diagram shows you the effect of a cause however, it does not show the relationship between these two. Note that these two diagrams are different. 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. See this article for a full explanation on producing a plot from a spreadsheet table.The scatter diagram is considered the simplest way to study the correlation between these two variables. This type of chart can be used in to visually describe relationships ( correlation) between two numerical parameters or to represent distributions.Įxcel is often used to generate scatter plots on a personal computer. Each x/y variable is represented on the graph as a dot or a cross. What is a scatter plotĪ scatter plot (or scatter diagram) is a two-dimensional graphical representation of a set of data. To clear the scatter graph and enter a new data set, press "Reset". To clear the graph and enter a new data set, press "Reset".įor the scatter plot to be displayed the number of x-values must equal the number of y-values. ![]() Press the "Submit Data" button to perform the computation.This flexibility in the input format should make it easier to paste data taken from other applications or from text books. Individual values within a line may be separated by commas, tabs or spaces. Individual x, y values (again, separated by commas or spaces) on each line. Data can be entered in two different formats:Ĭomma or space separated x values in the first line and comma or space separated y values in the second line, or. ![]()
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