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10 Cards in this Set
- Front
- Back
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scatterplots
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show the association between two quantitative variables measured on the same cases
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direct assocaition
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a positive direction or association means that, in general, as one variable increase, so does the other. When increase in one variable generally correspond to decreases in the other, the assocatiation is negative
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form association
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the form we care about most is straight, but you should certainly describe other patterns you see in scatterplots
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strength association
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a scatterplot is said to show a strong association if there is littler scatter around the underlying relationship
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y-axis
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response variable
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x-axis
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explanatory or predictor variable
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correlation coefficient
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a numerical measure of the direction and strength of a linear association
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kendall's tau
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a statistic that measure how close the relationship between two variables is to being monotone
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spearman's rho
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a correlation computed on the ranks of data values rather than their numberic values
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lurking variable
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a variable other than x and y that simultaneously affect both variables, accounting for the correlation between the two
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