Red and yellow creates orange. Yellow and blue creates green. The secondary colors can be mixed further to create additional shades. Tertiary colors are the result of a primary and secondary color mixed together. For example, orange mixed with red creates red-orange.
An influential point is an outlier that greatly affects the slope of the regression line. One way to test the influence of an outlier is to compute the regression equation with and without the outlier. This type of analysis is illustrated below.
Inspection of Figure 1 revealsthat the case labeled 3 is an outlier, but it isnot influential because, being outweighedby points at neighboring values, it cannot havemuch effect on the values of the estimatedcoefficients of the model. The case labeled 1,in contrast, is an outlier on x and is an in-fluential point.