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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