Calculate Difference between dates by group in R

Question

I\'m using a logistic exposure to calculate hatching success for bird nests. My data set is quite extensive and I have ~2,000 nests, each with a unique ID (\"ClutchID). I

Answer 1

Here is a similar solutions if you look for a difftime results in days, from a vector date, without NA values produce in the new column, and if you expect to group by several conditions/groups.

make sure that your vector of date as been converting in the good format as previously explained.

dat2 <- dat %>% 
select(group1, group2, date) %>% 
arrange(group1, group2, date) %>% 
group_by(group1, group2) %>% 
mutate(diff_date = c(0,diff(date)))