A. First, Dr. Schmid measures the length and width of the face. Then, she divides the length by the width. The ideal result—as defined by the golden ratio—is roughly 1.6, which means a beautiful person's face is about 1 1/2 times longer than it is wide.
B. Next, Dr. Schmid measures three segments of the face—from the forehead hairline to a spot between the eyes, from between the eyes to the bottom of the nose, and from the bottom of the nose to the bottom of the chin. If the numbers are equal, a person is considered more beautiful. 
C. Finally, statisticians measure other facial features to determine symmetry and proportion. On a perfect face, Dr. Schmid says the length of an ear is equal to the length the nose, and the width of an eye is equal to the distance between the eyes.