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- book-distinct-reviewers
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- book-rank-change-by-rating
- book-rating-change
- book-rating-trend-reversal
- book-rating-volatility
- book-review-count
- book-review-streak
- book-time-until-next-review
- book-top-rated
- reviewer-active
- reviewer-avg-review-length
- reviewer-churn
- reviewer-new-book-adoption
- reviewer-rating-trend-reversal
- reviewer-rating-trend
- reviewer-return
- reviewer-review-length-ratio
- reviewer-review-length-volatility
- reviewer-review-streak
- reviewer-time-until-next-review