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FUNCTION myCov(x, y) {
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center_x := x - avg(x);
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center_y := y - avg(y);
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num := sum(center_x * center_y);
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denom := sqrt(sum(center_x * center_x)) * sqrt(sum(center_y * center_y));
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num / denom
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}
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select myCov(1,2); |
