myPersonality participants. The interpretation of that result is that it “challenges the assumption that linguistic analysis of internet messages is related to underlying psychological states.” Here we show that a BoW model accounts for 3.4% of the variance in SWL scores. Moreover, the most important words the model finds are intuitive. Lower SWL is implied by “fucking”, “hate”, “bored”, “interview”, “sick”, “hospital”, “insomnia”, “farmville”, and “video”. The deleterious effects of joblessness, anger, chronic illness, and isolation are well documented. Words positively associated with SWL—“camping”, “imagination”, “epic”, “cleaned”, “success”—make similar sense.

Conversational AI on Facebook Messenger is an efficacious and scalable way to administer cognitive behavioral therapy [@fitzpatrick2017delivering]. Our results show linguistic analysis can shed light on underlying psychological states. This is important to find users that could benefit from such treatment.

### Belief in Star Sign

Compared to political identity, BSS has seven fewer classes and a far more homogeneous distribution. Even so, the BSS classifier performs slightly worse than the politics classifier and roughly on par to the baseline of predicting the mode. Unlike our race, gender, politics and sensational interests, we don’t wear belief in astrology on our sleeve.

Model Selection
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BoW models are somewhat unintuitive. Humans 