Unformatted text preview: You should also watch for curved relationships and clusters. After examining the overall pattern of the scatterplot, look for deviations from the pattern such as outliers. 3.2 The correlation measures the strength and direction of the linear relationship between two quantitative variables. It Is written as r. You always have to standardize the observation the equation for this is: r is positive when there is a positive association between the variables. Patterns closer to a straight line have correlations closer to 1 or -1 Perfect correlation is r= 1 Correlation ignores the distinction between explanatory and response variables. The value of r is not affected by changes in the unit of measurement of either variable....
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- Fall '08
- Statistics, explanatory variable attempts, response variable measures