[R] How to differ stats_cor labels by group on a ggplot

[Jim Lemon]

Hi Paulina,
Without data it's hard to work out what you are doing. Even a small
simulated data set would help to get answers.

Jim

On Fri, Jul 10, 2020 at 11:49 PM Paulina Skolasinska
<paulina.skol using hotmail.com> wrote:
>
> 'm using ggplot2 to plot two variables at a time. I'm plotting two age groups and overall data on the same graph. I'm also using stat_cor form the ggpubr package to report correlations for the two groups and overall data.
>
> I want each stat_cor label to have a custom subscript - the group name ("old", "young"). I have managed to do this for the overall data, but I don't know how to add custom labels for each group separately. I'd like the labels to look like this: https://imgur.com/a/naF7uNW
>
> > for (i in 18:21) {
>   p1 <- ggplot(df, mapping=aes(x = Age, y = unlist(df[i]), color=factor(AgeGroup))) +
>     geom_smooth(method="lm") +
>     geom_point(size = 4) +
>     geom_smooth(data=df, mapping = aes(x = Age, y = unlist(df[i]), group=1, color="black"), method = "lm") +
>     scale_colour_discrete(name="Group", labels=c("young", "old", "overall")) +
>     stat_cor(aes(color = factor(AgeGroup), y = unlist(df[i]))) +
>     stat_cor(aes(x = Age, y = unlist(df[i]), group=1, color="black",
>                  label = paste(sub("R",expression("R"[overall]),..r.label..), ..p.label.., sep = "~`,`~")))
>
>   ggsave(p1, file=paste0("Age_", names(df)[i], ".png"), scale=1)
> }
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