first version of 4th case study

week_04/CS_04_nocomments.R

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+# install.packages("tidyverse")
+# install.packages("nycflights13")
+
+library(tidyverse)
+library(nycflights13)
+library(dplyr)
+#check the contents of this dataset
+head(flights)
+glimpse(flights)
+view(flights)
+str(flights)
+
+glimpse(weather)
+glimpse(airlines)
+view(airports)
+glimpse(planes)
+#name, distance, and destination come from flights(distance,origin and dest),ffa and name come from airports 
+
+# find the farthest airport code from the New York Airports (JFK, LGA, EWR)
+farthest_airport_code <- flights %>%
+  filter(origin %in% c("JFK", "LGA", "EWR")) %>%
+  arrange(desc(distance)) %>%
+  slice(1) %>%
+  select(dest)
+
+# join this table with the 'airports' table to get the full airport name
+farthest_airport <- farthest_airport_code %>%
+  left_join(airports, by = c("dest" = "faa")) %>%
+  select(name) # only keep the name after left_join
+
+# convert the result to a single character value
+farthest_airport <- as.character(farthest_airport$name)
+
+# print the result
+farthest_airport
+
+
+airports %>%
+  distinct(lon,lat) %>%
+  ggplot(aes(lon, lat)) +
+  borders("world") +
+  geom_point(col="red") +
+  coord_quickmap()
+
+# calculate the average delay per airport (destination)
+avg_delay_per_airport <- flights %>%
+  group_by(dest) %>%
+  summarise(avg_delay = mean(arr_delay, na.rm = TRUE))  # calculate average delay
+
+# Join with the 'airports' table
+airport_delay_data <- avg_delay_per_airport %>%
+  left_join(airports, by = c("dest" = "faa"))  # join on airport code
+
+# create the plot with the average delay mapped to color
+airport_delay_data %>%
+  ggplot(aes(lon, lat, color = avg_delay)) +
+  borders("usa") +
+  geom_point(size = 3) +  # plot points for airports 
+  scale_color_gradient2(low = "#3575B3", mid = "white", high = "#BF3935", midpoint = 10, na.value = "grey50") +  # Color gradient with hex codes
+  coord_quickmap(xlim = c(-125, -65), ylim = c(20, 50)) +
+  labs(color = "Avg Delay (min)") +  # label for the color legend
+  theme_minimal()  # use a minimal theme for better visibility
+