Created
August 13, 2020 06:06
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Turning implicit missing values into explicit missing values.
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# tidyr::complete() & tidyr::full_seq() ----------------------------------- | |
# Turning implicit missing values into explicit missing values. | |
# Bonus: Filling in gaps in a date range | |
library(tidyr) | |
library(tibble) | |
library(dplyr) | |
# Making up some observations from two weather stations. | |
# Some fields are nested and shouldn't be crossed e.g. station and id. | |
# Other observations are missing days with no data. | |
weather <- tibble( | |
weather_station_id = c(123, 123, 123, 123, 456, 456, 456), | |
weather_station_name = c("Sydney", "Sydney", "Sydney", "Sydney", "Melbourne", | |
"Melbourne", "Melbourne"), | |
dates = c("2020-01-01", "2020-01-02", "2020-01-04", "2020-01-07", | |
"2020-01-02", "2020-01-04", "2020-01-07"), | |
temp = c(29, 31, 27, 24, 32, 34, 35), | |
) %>% | |
mutate(dates = as.Date(dates)) | |
weather | |
# Nesting the id and station name, expand()ing dates, but rather than | |
# use the dates present in the data we want to fill in the entire date sequence. | |
weather %>% | |
complete(nesting(weather_station_id, weather_station_name), | |
dates = full_seq(dates, 1)) |
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