Improvements for 03-data_vis_ggplot2

tavareshugo / r-intro-tidyverse-gapminder

Data Carpentry: Introduction to R/tidyverse

https://tavareshugo.github.io/r-intro-tidyverse-gapminder/

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Improvements for 03-data_vis_ggplot2 #3

Open tavareshugo opened 4 years ago

tavareshugo commented 4 years ago

[ ] Add explanation about relationship between geoms and stats.
[x] Add "Data Tip" about log-transformation.
[x] Add section on annotations (annotate(), geom_vline(), geom_hline())

tavareshugo commented 4 years ago

Regarding log-transformation:

perhaps explain absolute versus relative change: https://stats.stackexchange.com/a/48465
StatQuest video. There's a bit of qPCR at 7:24, which may be confusing for general audience, but still after that it gets generic again with arithmetic using logs. Doesn't talk about how its useful for skewed data though.

tavareshugo commented 4 years ago

Not sure how to explain geoms and stats without it getting confusing.

Here is a stackoverflow post with some comments.

Perhaps using some examples where one does the same graph either specifying geom or stat. And maybe adding an example where changing the default stat is useful, e.g. to overlay points with the mean on top of a boxplot.

Maybe this could be left as optional.