fede_luppi questions

• R- Calculate mean of Time variable mean(DateTime)
• Use different slopes in geom_abline across facets
• dplyr: mutate using rows rather than columns
• dplyr summarise_each standard error function
• Set transparency/saturation of palette in ggplot
• plot mixed effects model in ggplot
• Dplyr - Mean for multiple columns

fede_luppi answers