public double intercept() {
        return alpha;
    }
Returns the <em>y</em>-intercept &alpha; of the best of the best-fit line <em>y</em> = &alpha; + &beta; <em>x</em>.
@return the <em>y</em>-intercept &alpha; of the best-fit line <em>y = &alpha; + &beta; x</em>
library/src/main/java/com/lorentzos/flingswipe/LinearRegression.java