SOC202H1 Lecture Notes - Linear Regression, Scatter Plot, Linear Equation

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20 Apr 2013
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Correlation a systematic change in the scores of two interval/ratio. Used only when there"s a linear relationship between x and y. Graphical representation of the relationship between two interval/ratio variables: scatterplot: A two-dimensional grid of coordinates of two interval/ratio variables, x and y on the x-axis and y-axis: coordinate: A point on a scatterplot where the values of x and y are plotted for a case: linear pattern, divide scatter plot into 4 quadrants by and , note the relationship. Quadrant 1 & 4 populated = negative relationship; quadrant 2 & 3 populated = positive relationship; no pattern = no relationship: all elements of r equation involve deviation scores, r gauges how deviation scores of y and y fluctuate together (covary) If positive relationship then expect samples on positive side of also on the positive side of . Denominator gauges how much total error x and y have relative to one another. Assuming no relationship between x and y.

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