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I'm currently conducting a statistical test on unimodality but I'm a little unsure about the R-output:

R output

I'm curious about the difference between the meanings of poly(X, 2)1 and poly(X, 2)2?

Heikki
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Ajay Arjoon
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  • Check out the `?poly` help page for some info. Otherwise it's easier to help if you provide a proper [reproducible example](https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example) with data and code that we can run (rather than an image) so we can exactly answer your question. – MrFlick Oct 23 '20 at 18:53
  • Those are the coefficients of `X` and `X^2`, respectively, in your model. – eipi10 Oct 23 '20 at 19:03

1 Answers1

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When you run poly(Dat$X, 2), you get a matrix with two columns, named "1" and "2". poly(X, 2)1 and poly(X, 2)2 in your output refer to those two columns.

LC-datascientist
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  • Thank you! With my output is it therefore safe to say there is a quadratic relationship and significant unimodal response? – Ajay Arjoon Oct 23 '20 at 19:48