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When doing the regression model: when age squared has a negative coefficient and the p value is significant, it proves that they are non-linear. when
When doing the regression model:
when age squared has a negative coefficient and the p value is significant, it proves that they are non-linear.
when people getting older, then age is not a premium.
But what does it mean if I get a negative coefficient for age squared but p-value is insignificant?
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