I have an R data frame with multiple observations per day (table 1). There are multiple columns. I would like to summarise each day to an average for each day (for all columns). See table 2. A single number per day for all columns and rows. I have looked at dplyr and group_by, however can only get it to work with a single column (date + 1 column, not date >1 column). Appreciate your assistance.
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