在 R 中使用 lines() 时，行未出现在 plot 上

Question

I'm doing a polynomial regression and I want to plot it.

My code is the following:

to create polynomial regression to degree 1

mreg6=lm(user_Score~poly(year_of_Release,1)) 

to create plot

plot(year_of_Release~user_Score, col='gray')

to create line

lines(sort(year_of_Release),predict(mreg6)[order(year_of_Release)],col='red')

to create legend

legend('topright',lty=1:2,col=c('red'),c('degree 1'))

When I run the code, there is no error but the line does not appear on graph. Do any of you know what I might be doing wrong?

Answer 1

I found my answer: I was putting ~ instead of, in plot() so it was giving me another regression.