SOAN 2120 Lecture : SOAN LEC 14 - FEB 8

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In a scatterplot one axis is used to represent each of the variables, and the data are plotted as points on the graph. Some plots don"t have clear explanatory and response variables. Form and direction of an association: linear, non-linear, non-relationship. The correlation coefficient is the measure of the direction and strength of a relationship. It is calculated using the mean and the standard deviation of the the x and y variables. Correlation can only be used to describe quantitative variables. Categorical variables don"t have means and standard deviations. R quantifies the strength and direction of a linear relationship between two quantitative variables. Strength: how closely the points follow a straight line. Direction: is positive when individuals with higher x values tend to have higher values of y. Step 2: examining empirical relationships: examine bivariate relationships among items, examine multivariate relationships among items. Step 3: index scoring: assign scores for particular responses.

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