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. Author manuscript; available in PMC: 2015 Oct 1.
Published in final edited form as: Prev Sci. 2014 Oct;15(5):611–622. doi: 10.1007/s11121-013-0390-x

Figure 2.

Figure 2

The left panel shows how over a short time span a quadratic function and an exponential decay function can be approximately equivalent. The right panel shows that over a longer time span an exponential decay function approaches an asymptote while the quadratic function approaches infinity.