Why the coefficients of the linear term and the quadratic term become insignificant after dropping the interaction term? - Statalist
![Sage Research Methods Datasets Part 2 - Learn About Analysing Age in Survey Data Using Polynomial Regression in Stata With Data From the Wellcome Trust Monitor Survey (2009) Sage Research Methods Datasets Part 2 - Learn About Analysing Age in Survey Data Using Polynomial Regression in Stata With Data From the Wellcome Trust Monitor Survey (2009)](https://pltfrmrsrcscdn.sagepub.com/srm/images/age-polynomial-in-wtms-2009-stata/10.4135_9781526497420-fig6.jpg)
Sage Research Methods Datasets Part 2 - Learn About Analysing Age in Survey Data Using Polynomial Regression in Stata With Data From the Wellcome Trust Monitor Survey (2009)
Why the coefficients of the linear term and the quadratic term become insignificant after dropping the interaction term? - Statalist
![Sage Research Methods Datasets Part 2 - Learn About Analysing Age in Survey Data Using Polynomial Regression in Stata With Data From the Wellcome Trust Monitor Survey (2009) Sage Research Methods Datasets Part 2 - Learn About Analysing Age in Survey Data Using Polynomial Regression in Stata With Data From the Wellcome Trust Monitor Survey (2009)](https://pltfrmrsrcscdn.sagepub.com/srm/images/age-polynomial-in-wtms-2009-stata/10.4135_9781526497420-fig4.jpg)