  Personality and demographics are important variables in social sciences,
while in NLP they can aid in interpretability and removal of societal biases.
However, datasets with both personality and demographic labels are scarce. To
address this, we present PANDORA, the first large-scale dataset of Reddit
comments labeled with three personality models (including the well-established
Big 5 model) and demographics (age, gender, and location) for more than 10k
users. We showcase the usefulness of this dataset on three experiments, where
we leverage the more readily available data from other personality models to
predict the Big 5 traits, analyze gender classification biases arising from
psycho-demographic variables, and carry out a confirmatory and exploratory
analysis based on psychological theories. Finally, we present benchmark
prediction models for all personality and demographic variables.
