dplyr count observations per day

Question

I have the following data

Name         Date                                   Message
Ted Foe      2011-06-10T05:06:30+0000               I love this product
Sin         


        

Answer 1

Grouped by the 'Date' column after converting to Date class, we get the number of rows (n()) with summarise. If we need the 'Date' elements that are missing in the original dataset, create a new dataset with the sequence of minimum to maximum 'Date' and do a left_join

df1 <- df %>%
          group_by(Date = as.Date(Date)) %>%
          summarise(comments = n())
expand.grid(Date = seq(min(df1$Date), max(df1$Date), by = '1 day')) %>%
         left_join(., df1)