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Please add alt text to your posts

Please add alt text (alternative text) to all of your posted graphics for #TidyTuesday.

Twitter provides guidelines for how to add alt text to your images.

The DataViz Society/Nightingale by way of Amy Cesal has an article on writing good alt text for plots/graphs.

Here’s a simple formula for writing alt text for data visualization:

Chart type

It’s helpful for people with partial sight to know what chart type it is and gives context for understanding the rest of the visual. Example: Line graph

Type of data

What data is included in the chart? The x and y axis labels may help you figure this out. Example: number of bananas sold per day in the last year

Reason for including the chart

Think about why you’re including this visual. What does it show that’s meaningful. There should be a point to every visual and you should tell people what to look for. Example: the winter months have more banana sales

Link to data or source

Don’t include this in your alt text, but it should be included somewhere in the surrounding text. People should be able to click on a link to view the source data or dig further into the visual. This provides transparency about your source and lets people explore the data. Example: Data from the USDA

Penn State has an article on writing alt text descriptions for charts and tables.

Charts, graphs and maps use visuals to convey complex images to users. But since they are images, these media provide serious accessibility issues to colorblind users and users of screen readers. See the examples on this page for details on how to make charts more accessible.

The {rtweet} package includes the ability to post tweets with alt text programatically.

Need a reminder? There are extensions that force you to remember to add Alt Text to Tweets with media.

Dog breeds

The data this week comes from the American Kennel Club courtesy of KKakey - thanks!

  • breed_traits - trait information on each dog breed and scores for each trait (wide format)
  • trait_description - long descriptions of each trait and values corresponding to Trait_Score
  • breed_rank_all - popularity of dog breeds by AKC registration statistics from 2013-2020

USA Today Article and Vox with more graphics.

Get the data here

# Get the Data

# Read in with tidytuesdayR package 
# Install from CRAN via: install.packages("tidytuesdayR")
# This loads the readme and all the datasets for the week of interest

# Either ISO-8601 date or year/week works!

tuesdata <- tidytuesdayR::tt_load('2022-02-01')
tuesdata <- tidytuesdayR::tt_load(2022, week = 5)

breed_traits <- tuesdata$breed_traits

# Or read in the data manually

breed_traits <- readr::read_csv('https://raw.githubusercontent.com/rfordatascience/tidytuesday/master/data/2022/2022-02-01/breed_traits.csv')
trait_description <- readr::read_csv('https://raw.githubusercontent.com/rfordatascience/tidytuesday/master/data/2022/2022-02-01/trait_description.csv')
breed_rank_all <- readr::read_csv('https://raw.githubusercontent.com/rfordatascience/tidytuesday/master/data/2022/2022-02-01/breed_rank.csv')

image of five puppies sitting and looking at camera with a white background

Data Dictionary

breed_traits.csv

variable class description
Breed character Dog Breed
Affectionate With Family character Placement on scale of 1-5 for the breed's tendancy to be "Affectionate With Family" (Trait_Score)
Good With Young Children character Placement on scale of 1-5 for the breed's tendancy to be "Good With Young Children" (Trait_Score)
Good With Other Dogs character Placement on scale of 1-5 for the breed's tendancy to be "Good With Other Dogs" (Trait_Score)
Shedding Level character Placement on scale of 1-5 for the breed's "Shedding Level" (Trait_Score)
Coat Grooming Frequency character Placement on scale of 1-5 for the breed's "Coat Grooming Frequency" (Trait_Score)
Drooling Level character Placement on scale of 1-5 for the breed's "Drooling Level" (Trait_Score)
Coat Type character Description of the breed's coat type (Trait_Score)
Coat Length character Description of the breed's coat length (Trait_Score)
Openness To Strangers character Placement on scale of 1-5 for the breed's tendancy to be open to strangers (Trait_Score)
Playfulness Level character Placement on scale of 1-5 for the breed's tendancy to be playful (Trait_Score)
Watchdog/Protective Nature character Placement on scale of 1-5 for the breed's "Watchdog/Protective Nature" (Trait_Score)
Adaptability Level character Placement on scale of 1-5 for the breed's tendancy to be adaptable (Trait_Score)
Trainability Level character Placement on scale of 1-5 for the breed's tendancy to be adaptable (Trait_Score)
Energy Level character Placement on scale of 1-5 for the breed's "Energy Level" (Trait_Score)
Barking Level character Placement on scale of 1-5 for the breed's "Barking Level" (Trait_Score)
Mental Stimulation Needs character Placement on scale of 1-5 for the breed's "Mental Stimulation Needs" (Trait_Score)

trait_description.csv

variable class description
Trait character Dog Breed
Trait_1 character Value corresponding to Trait when Trait_Score = 1
Trait_5 character Value corresponding to Trait when Trait_Score = 5
Description character Long description of trait

breed_rank_all.csv

variable class description
Breed character Dog Breed
2013 Rank character Popularity of breed based on AKC registration statistics in 2013
2014 Rank character Popularity of breed based on AKC registration statistics in 2014
2015 Rank character Popularity of breed based on AKC registration statistics in 2015
2016 Rank character Popularity of breed based on AKC registration statistics in 2016
2017 Rank character Popularity of breed based on AKC registration statistics in 2017
2018 Rank character Popularity of breed based on AKC registration statistics in 2018
2019 Rank character Popularity of breed based on AKC registration statistics in 2019
2020 Rank character Popularity of breed based on AKC registration statistics in 2020
links character Link to the dog breed's AKC webpage
Image character Link to image of dog breed

Scripts to retrieve the data:

Last retrieved on Dec. 23, 2021