SlideShare a Scribd company logo
• Text Analysis and Knowledge Engineering Lab
Faculty of Electrical Engineering and Computing
University of Zagreb
takelab.fer.hr
Personality Prediction and NLP
Author profiling
Gender
Age
Personality
Occupation
Personality
• The combination of characteristics or qualities that form an individual's
distinctive character.
• A set of habitual behaviors, cognitions and emotional patterns that
evolve from biological and environmental factors
Personality
– Big Five
Personality
– MBTI
MBTI vs Big Five
• Big 5
• valid and reliable
• MBTI
• used for self-discovery, Human Resources, dating
• „the fad that won’t die”
• very popular in US
Michal Kosinski
Michal Kosinski
C
a
m
b
r
i
d
g
e
A
n
a
l
y
t
i
c
a
Facebook Twitter Essays Forums EAR
Anonymus n y/n n y n
Diverse
Topics
y/n y/n n n n
A lot of
users
y y n n n
Expressivity y/n n y y y
Biased y
Ease of
labelling
n y n y n
Facebook Twitter Essays Forums EAR Reddit
Anonymus n y/n n y n y
Diverse
Topics
y/n y/n n n n y
A lot of
users
y y n n n y
Expressivity y/n n y y y y
Biased y
Ease of
labelling
n y n y n y
Reddit
• Over 1.2
million
subreddits
• 330 million
users
• 4th web-site
in US, 6th in
the world
Data
acquisition
• 122 MBTI-related
subreddits
• 13,631 users with MBTI
flairs
Data
acquisition
• 122 MBTI-related
subreddits
• 13,631 users
• 36,676 subreddits
• 354,996 posts
• 22.9 million
comments
• 583 million words
Reddit and personality
Topical affinity
LDA, entropy,
semantic
categories
User activity
features
Psycholinguistic
features
26
Linguistic features
Linguistic Inquiry
and Word Count
(LIWC)
93
Character and
word n-grams
11400
Comments
and posts
metrics
Commening
behavior
Temporal
features
Extrovert -
introvert
Friend
Social
„friday”
„at
least”
„i’m an
extrovert”
Exclam
Inuitive - Sensing
Is_self_median
Avg_img
„my ”
„cliché”
„exist”
Sixltr
Thinking-Feeling
„happy”
„love”
pronoun
Affect
Emotion
„i love”
Judging-
Perceiving
„husband”
„plan”
Work
Home
„help”
Feature analysis
Top 30 relevant features
distribution
Relevant features per group
and dimension
Feature analysis
Relevant features per group
Experimental setup and models
• SVM, Logistic Regression, MLP (3-layered)
• Nested stratified cross-validation for each dimension
• 5 outer loops
• 5 or 10 inner loops (C, gamma)
• F1 macro evaluation criterion
• class-weighting
• Per feature group and using all features (selection)
Results
Results
What’s next?
• More data
• Dataset augmentation (age, gender, ..)
• Deep learning
• multi-task (age, gender, religion, sexuality, political stance)
• domain adaptation (Twitter)
• Challenges
• How to model large number of comments?
• How to behavioral patterns and temporal change?
Questions?
• Personality prediction on Reddit
• https://peopleswksh.github.io/pdf/PEOPLES12.pdf
• https://www.gsb.stanford.edu/insights/science-behind-cambridge-
analytica-does-psychological-profiling-work
• The End of privacy – Kosinski:
• https://www.youtube.com/watch?v=X9jVjCVOUIM
• https://scholar.google.hr/scholar?hl=en&as_sdt=0,5&q=stillwell+kosi
nski
• http://www.wired.co.uk/article/chinese-government-social-credit-
score-privacy-invasion
• http://www.wwbp.org/publications.html

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Personality Prediction on Reddit

Editor's Notes

  1. LiveSlide https://www.reddit.com/r/INTP/comments/8lkb2o/when_was_the_last_time_you_felt_happy/