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Median age by local authority
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| # Median age by local authority | |
| # Source: 2021 Census | |
| # URL: https://www.nomisweb.co.uk/datasets/c2021ts007 | |
| library(tidyverse) ; library(nomisr) ; library(sf) ; library(tmap) | |
| # return Topic Summary tables | |
| metadata <- nomis_search(name = "TS*") | |
| # filter Topic Summary tables containing 'Age' | |
| metadata |> | |
| filter(str_detect(name.value, 'Age')) |> | |
| select(id, name.value) | |
| # return geographies for 'Age by single year' table | |
| nomis_get_metadata(id = "NM_2027_1", | |
| concept = "GEOGRAPHY", | |
| type = "type") | |
| # get data | |
| request <- nomis_get_data(id = "NM_2027_1", | |
| time = c("latest"), | |
| geography = "TYPE154") | |
| # calculate median age | |
| df <- request |> | |
| filter(MEASURES_NAME == "Value", | |
| str_detect(C2021_AGE_102_CODE, "_")) |> | |
| select(areacd = GEOGRAPHY_CODE, | |
| age = C2021_AGE_102, | |
| n = OBS_VALUE) |> | |
| group_by(areacd, age) |> | |
| summarise(n) |> | |
| summarise(median_age = age[max(which(cumsum(n)/sum(n) <= 0.5))]) | |
| # Local authority boundaries (2021) | |
| # Source: ONS Open Geography Portal | |
| # URL: https://geoportal.statistics.gov.uk/datasets/ons::local-authority-districts-december-2021-gb-buc-1 | |
| lad <- read_sf("Local_Authority_Districts_December_2021_GB_BUC_2022_1023427260691650215.geojson") |> | |
| filter(!str_detect(LAD21CD, "^S")) |> | |
| select(areacd = LAD21CD, areanm = LAD21NM) |> | |
| st_transform(4326) | |
| # join tabular data to spatial layer | |
| sf <- left_join(lad, df, by = "areacd") | |
| # plot results | |
| tmap_mode("view") | |
| tm_shape(sf) + | |
| tmap_options(check.and.fix = TRUE) + | |
| tm_fill(col = "median_age", | |
| style = "jenks", | |
| palette = c("#e1fcf8", "#9ccad5", "#5e99af", "#136a85", "#003b55"), | |
| alpha = 0.7, | |
| colorNA = "grey50", | |
| id = "areanm", | |
| popup.vars = c("Median age (2021):" = "median_age"), | |
| title = "Median age (years), 2021") + | |
| tm_borders(col = "#000000") + | |
| tm_layout(title = "Age structure of the population, 2021<br><span style='font-weight: normal;'>Local authorities in England and Wales</span><br><span style='font-weight: normal; font-size: 0.875em;'>Source: 2021 Census</span>") | |
| # export results | |
| tmap_last() %>% | |
| tmap_save("index.html") |
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