![]() Prism can compute area under the curve also for XY tables you enter, and does not insist that the X values be equally spaced. The left part of the figure above shows two of these points and the baseline as a dotted line. The area under that portion of the curve, a trapezoid, is shaded. ![]() The middle portion of the figure shows how Prism computes the area. The two triangles in the middle panel have the same area, so the area of the trapezoid on the left is the same as the area of the rectangle on the right (whose area is easier to calculate). Prism uses this formula repeatedly for each adjacent pair of points defining the curve. The area is computed using the baseline you specify and the curve between two X values. If all your data points are larger than the baseline, the AUC calculations start at the lowest X value in your data set and end at the largest X value.Note that Prism does not extend the curve beyond the X range of your data.
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June 2023
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