This is not normal(ised)

This article is originally published at https://nsaunders.wordpress.com

“Sydney stations where commuters fall through gaps, get stuck in lifts” blares the headline. The story tells us that:

Central Station, the city’s busiest, topped the list last year with about 54 people falling through gaps

Wow! Wait a minute…

Central Station, the city’s busiest

Some poking around in the NSW Transport Open Data portal reveals how many people enter every Sydney train station on a “typical” day in 2016, 2017 and 2018. We could manipulate those numbers in various ways to estimate total, unique passengers for FY 2017-18 but I’m going to argue that the value as-is serves as a proxy variable for “station busyness”.

Grabbing the numbers for 2017:

library(tidyverse)

tibble(station = c("Central", "Circular Quay", "Redfern"),
       falls   = c(54, 34, 18),
       entries = c(118960, 27870, 30570)) %>%
  mutate(falls_per_entry = falls/entries) %>%
  select(-entries) %>%
  gather(Variable, Value, -station) %>%
  ggplot(aes(station, Value)) +
    geom_col() +
    facet_wrap(~Variable,
               scales = "free_y")

Looks like Circular Quay has the bigger problem. Now we have a data story. More tourists? Maybe improve the signage.

Deep in the comment thread, amidst the “only themselves to blame” crowd, one person gets it:

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