Ignore any outliers as they are not part of the linear relationship between the two variables.Given that two variables seem to have a linear correlation based on the scatter plot, the following guidelines can be used to sketch a line of best fit: The two variables below do not exhibit a discernible pattern, so they have no correlation. In this case, the line of best fit is a parabola, so the data has a non-linear correlation. Although the two variables in the figure below do not exhibit any linear correlation, we can see that they do still have a pattern. This is also shown by the fact that the line of best fit has a negative slope.Ī non-linear correlation is one in which a pattern exists between the two variables that cannot be described by a straight line. In the scatter plot below, variable 2 decreases as variable 1 increases, so the variables have a negative correlation. When two variables have a negative correlation, one variable increases as the other decreases. In the scatter plot below, the red line, referred to as the line of best fit, has a positive slope, so the two variables have a positive correlation. Positive correlationĪ positive correlation is one in which the two variables increase together. Scatter plots can show various types of correlations between variables. Below is a scatter plot showing the relationship between the cost and weight of some product: Scatter plots are often used when studying the relationship between two variables. Home / probability and statistics / descriptive statistics / scatter plot Scatter plotĪ scatter plot is a type of plot that displays values, typically for two variables, using cartesian coordinates.
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