Because this model gets infinite as the distance d goes to zero, the relative risk function blows up at the origin. We thus portray the inverse of the additive model: as this surface tends towards 0 at the center, the RR is tending towards infinity.
| Inverse of RR: | Additive Risk Model: |
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This model has a serious potential problem: it is
infinite at the origin (the focus). This model is appropriate if, as you
approach the focus, your chance of getting the disease increases towards
certainty. Because this model gets infinite as the distance d goes to zero, the relative risk function blows up at the origin. We thus portray the inverse of the additive model: as this surface tends towards 0 at the center, the RR is tending towards infinity. |
| RR: | Multiplicative Risk Model 1: |
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This multiplicative model comes to a sharp point at the origin: risk increases more rapidly as one approaches the origin. |
| RR: | Multiplicative Risk Model 2: |
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Much smoother than the other multiplicative models. |
| RR: | Multiplicative Risk Model 3: |
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Very similar to Model 1. |