I'm a bit of in newby with R, so please be gentle (: Currently I am visualizing my data using boxplots (ggplot2). In my data set I have individuals (df$Fish_ID) who all are tested twice (df$Exposure) which is eighter "1" or "2". I've made multiple boxplot for different treatments and different treatment, all using all the data to compare. Is there is possiblity where I can compare the difference in mean( difference between Exposure1 vs Exposure 2) and make this visual in a boxplot? So for example; instead of comparing all the data of Exposure 1 vs Exposure 2, only compare this for every individual apart. Is this possible in ggplot2 or do I have to perform statistics first?
I hope my question is clear, thank you in advance for your help!