Unexpected behavior with `ggplot2` when using `geom_smooth()` with grouped data and `facet_wrap()`
Hey everyone, I'm running into an issue that's driving me crazy... Hey everyone, I'm running into an issue that's driving me crazy. I'm encountering an unusual situation when trying to plot grouped data with `ggplot2`. I have a data frame with multiple groups and when I try to apply `geom_smooth()` within a `facet_wrap()`, the smoothing lines behave unexpectedly. Instead of generating a smooth line for each group, it seems to be combining the data across all groups for some facets. Here's a snippet of my code: ```r library(ggplot2) # Sample data frame set.seed(123) df <- data.frame( group = rep(c("A", "B"), each = 50), x = rep(1:50, 2), y = c(rnorm(50, mean = 5), rnorm(50, mean = 10)) ) # Plotting with ggplot2 ggplot(df, aes(x = x, y = y, color = group)) + geom_point() + geom_smooth(method = "loess") + facet_wrap(~ group) ``` Running this code gives me a plot where the `geom_smooth` line for group "A" is getting influenced by the data in group "B". From what I understand, the `loess` method should calculate the smooth line within each group context. However, in my plot, it seems to be pulling the data across both groups when displayed in the facets. I tried checking the data structure and ensuring it is correctly grouped, and I also specified `method = "loess"` explicitly, but the issue persists. Additionally, I tried using `group = group` inside `aes()` for `geom_smooth()`, but that did not change the outcome. I am using `ggplot2` version 3.3.5. Is there a specific way to handle this that ensures `geom_smooth()` works correctly within `facet_wrap()` for grouped data? Any insights would be greatly appreciated! My development environment is macOS. What am I doing wrong? My development environment is Ubuntu. Any help would be greatly appreciated! My development environment is Ubuntu. I'd really appreciate any guidance on this.