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The SAS output for the polynomial parameters estimates for the effect of red meat on CRC rate (Equation 4). The parameter estimates of zero for a1 indicates that the equation is parabolic and there is no linear correlation between meat consumption and CRC rate.
| Parameter Estimates | |||||
|---|---|---|---|---|---|
| Variable | DF | Estimate | Standard Error | t Value | P-Value |
| Intercept (α) | 1 | −96.5968 | 15.6279 | −6.18 | <.0001 |
| a0 | 1 | 0.3789 | 0.0402 | 9.43 | <.0001 |
| a1 | 1 | 0 | 0 | ||
| a2 | 1 | −0.1468 | 0.0156 | −9.43 | <.0001 |
