STAT151 Lecture : Linear Regression and Correlation Done in LaTeX
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STAT151 Full Course Notes
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Response or dependent variable: the outcome variable on which comparisons are made. Explanatory or independent variable: de nes the group to be compared with respect to the values of the response variable. Scatter-plot: a graphical display for two quantitative variables. It uses the horizontal axis for the explanatory variable x and the vertical axis for the response y . The values of x and y for a subject are represented by a point relative to the two axes. The observations for the subjects are points on the scatter-plot. Positive association: when two quantitative variables to have a high values of x with high values of y , and low values of x with low values of y . Negative association: two quantitative variables with a high value of x tending to occur with low value of y , and vice versa. 1001234567891002468x axisy axis1001234567891002468x axisy axisnote: when the correlation is non-linear, it is best to nd an intermediary.