I am analyzing a set of data with many columns (almost 30 columns). I want to group data based on two columns and apply sum and mean functions to all the columns except timestamp. How would I use summarise_each on all columns except timestamp?
This is the draft code I have but it obviously not correct. Plus it generates and error because it can not apply Sum to POSIXt data type (Error: 'sum' not defined for "POSIXt" objects)
features <- dataset %>%
group_by(X, Y) %>%
summarise_each(funs(mean,sum)) %>%
arrange(TIMESTAMP)