STATISTICAL TECHNIQUES AND TOOLS
REGRESSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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larger than most other values in the y-direction
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larger than most other values in the x-direction
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not an outlier
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an outlier in the x direction
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Detailed explanation-1: -An outlier is a data point whose response y does not follow the general trend of the rest of the data. A data point has high leverage if it has “extreme” predictor x values. With a single predictor, an extreme x value is simply one that is particularly high or low.
Detailed explanation-2: -Instead of calling them x-or y-unusual observations, they are categorized as leverage or outlier and these are considered as influential points as they obviously impact the outcome of the regression model. These unusual observations aka outliers aka influential points are observed on x-value or y-value.
Detailed explanation-3: -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.