Briefly interpret the value 0.0007767 in the regression output:

This value means that when the decade is 0.0007767, the proportion generalist is equal to zero.

It is the slope estimate, also the coefficient of age in the regression equation

$$B_j=0$$

oh come on!

For every zero decade or at zero decade, there's a decrease of 0.9651161 for the proportion of generalist species

This value is the proportion of generalists in the population when the species first started

(that being a negative proportion)

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