What the data shows
Jev matches the writer's tag on 53% of tweets, about three times what guessing would get. It does better on some emotions than others:
- Sadness, fear and joy come out best: 67%, 65% and 65%.
- Anger matches 46% of the time, and a quarter of anger tweets (25%) are called sadness. A hand-picked example: "i feel like i am a selfish person", tagged #anger by its writer, which Jev calls sadness. Self-blame can read as sad, and a human reader might say the same.
- Love and surprise are the weakest, 35% and 36% (love's 90% interval: 31% to 40%). Love goes to joy 25% of the time and almost as often to sadness (74 tweets against 81). Surprise goes to joy 23% of the time and to fear on 64 tweets. The hand-picked love tweet quoted above, "i feel blessed that i am free to be me", Jev called joy.
- Sadness is the catch-all. It's Jev's most common wrong answer for joy (16%), anger (25%) and fear (14%). Sadness tweets themselves hold up best; their most common wrong answer, joy, takes 10%.
On gratitude, Jev errs toward saying no. It misses 15% of the comments raters marked thankful and calls only 1.1% of the others thankful. Several of the misses are welcomes, congratulations or good-luck wishes rather than thanks (hand-picked: "welcome to the community, my good dude!" and "you should definitely negotiate and ask. you have nothing to lose by asking. good luck!"), where the raters' idea of gratitude seems looser than the description Jev was given.
What it means, and what it doesn't
If Jev were used to count emotions in short posts, sadness and joy would come out inflated and love, surprise and anger deflated. The direction of the mix-ups matches other experiments: Jev tends to fold a feeling into a nearby, broader or milder one (see "Jev hears shame as guilt" and "Jev almost never calls anyone furious or terrified").
What this doesn't show is how often Jev is wrong about the tweets themselves. The labels are the writers' hashtags, and several of the misses read as fair calls on the text: a tweet about enjoying art tagged #love, or one about feeling selfish tagged #anger. The comparison to make next is against readers' labels for the same tweets. On gratitude, Jev is conservative: when it says a comment is thankful, it nearly always is.