[R] ggplot2: Get the regression line with 95% confidence bands

[Rui Barradas]

Às 22:35 de 10/12/2023, varin sacha via R-help escreveu:
> 
> Dear R-experts,
> 
> Here below my R code, as my X-axis is "year", I must be missing one or more steps! I am trying to get the regression line with the 95% confidence bands around the regression line. Any help would be appreciated.
> 
> Best,
> S.
> 
> 
> #############################################
> library(ggplot2)
>   
> df=data.frame(year=factor(c("2012","2015","2018","2022")), score=c(495,493, 495, 474))
>   
> ggplot(df, aes(x=year, y=score)) + geom_point( ) + geom_smooth(method="lm", formula = score ~ factor(year), data = df) + labs(title="Standard linear regression for France", y="PISA score in mathematics") + ylim(470, 500)
> #############################################
> 
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Hello,

I don't see a reason why year should be a factor and the formula in 
geom_smooth is wrong, it should be y ~ x, the aesthetics envolved.
It still doesn't plot the CI's though. There's a warning and I am not 
understanding where it comes from. But the regression line is plotted.



ggplot(df, aes(x = as.numeric(year), y = score)) +
   geom_point() +
   geom_smooth(method = "lm", formula = y ~ x) +
   labs(
     title = "Standard linear regression for France",
     x = "Year",
     y = "PISA score in mathematics"
   ) +
   ylim(470, 500)
#> Warning message:
#> In max(ids, na.rm = TRUE) : no non-missing arguments to max; 
returning -Inf



Hope this helps,

Rui Barradas



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