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developed in a study at the University
of Iowa in
the 1950s comprised of a set of 31
patterns of asset
retirement dispersion organized into four
broad classes, as
Purpose and Application of the Curves
Each curve represents a probability distribution and has a series of attributes. The curves are helpful in a variety of ways, including:
Listed below are some of the attributes of each of the four classes of Iowa curves.
Fig. Some of the key statistical elements of an asset survivor curve.
Fig. Left-modal curves (shown in "blue") and right-modal curves (shown in "green) relative to their respective modes and their means.
Fig. Bell curve (in "red") with perfect symmetry compared to skewed curves.
Fig. Generic left-modal ("L") curve (with positive skewness) indicating a long right tail.
Fig. Example of the probability distribution along a left-modal ("L") curve (positive skewness).
Fig. Right modal curves to order-1, order-2 and order-3 (left) and three performance classes along a right-modal survivor curve (right) .
Fig. I. Care is trying to connect the dots to reveal the patterns in the data that underpin his assets.
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