I drew phillips curve for 2007-2020 and I want to add quadratic trend. My phillips curve form is as follows:
plot(u, p, xlab="u", ylab="p")
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mosc9575
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1Do you have a specific programming language in mind? If so, please add this tag to your question. Right now there are missing some information. – mosc9575 Jan 28 '21 at 22:05
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my series; p – Koray Yıldırım Jan 29 '21 at 17:09
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Please [edit](https://stackoverflow.com/posts/65945010/edit) your post. Don't post your code as a comment. And which programming language do you use? – mosc9575 Jan 29 '21 at 17:10
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ım using R programming language – Koray Yıldırım Jan 29 '21 at 20:05
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Maybe this post [here](https://stackoverflow.com/questions/2564258/plot-two-graphs-in-same-plot-in-r) will help you. – mosc9575 Jan 29 '21 at 21:24