What event marked the beginning of the US Civil War? The main cause of the Civil War has been debated for years. The first military action was Confederate forces attacking Union Fort Sumter.
1 Lift Charts. 2  The lift curve is a popular technique in direct marketing. 3  The input required to construct a lift curve is a validation dataset that has been scored by appending to each case the estimated probability that it will belong to a given class.
The tangent at a given point on a curve is the straight line that just touches the curve at the given point. Leibniz defined this as being the straight line through two infinitesimally close points on the curve at that point, leading to the relationship between the slope of the tangent and the first derivative of the function (if both exist) at that point.