Film · 1974 · Films · 1970s
Black Christmas
Scored from 443 calibrated IMDb reviewers, each re-centered on their own rating baseline before the title is ranked. Cohort: Films · 1970s (2,406 peers).
Summary
A group of sorority sisters face an escalating reign of terror when an unknown killer begins stalking them during the Christmas holiday season. As mysterious and threatening phone calls increase, the women struggle to identify their attacker and survive the night.
Black Christmas is a 1974 horror, thriller and mystery film. It stars Olivia Hussey, Keir Dullea and Margot Kidder. It is rated R. It was made in Canada. It was directed by Bob Clark. The runtime is 98 minutes.
A second review pool sits behind it as well: 5,141 Rotten Tomatoes reviewers clear the same calibration test, and Rankquant scores them separately. Its in-cohort standing is measured against the other 2,405 1970s films, not against the whole corpus. 443 IMDb reviewers rate with enough spread for a personal baseline to be measured, and those are the ones the calibrated score reads; a separate, broader pool of 453 reviewers with at least two reviews each feeds the raw-average track.
How the score was built
We compare the reviewers of this title against every other title those same people reviewed. Each review is scored relative to the reviewer's own baseline — a 7/10 from a hard grader sits well above their average, while a 7/10 from a generous grader sits below theirs. Every reviewer then counts the same, so the result is a calibrated consensus rather than a raw average.
- Global percentile
- Where Black Christmas lands against every title we rank.
- In-cohort percentile
- The same comparison narrowed to its cohort — titles of the same format released in the same decade. A 1970s film is judged against 1970s films, not against last year's streaming series. Ranked against Films · 1970s (2,406 titles).
- AI-adjusted percentile
- The same reviewer-normalized score, corrected for how much confidence the sample supports: thin samples are pulled toward the corpus average. Each title keeps the share n / (n + 53) of its measured distance from the average, where n is its calibrated-reviewer count, and the result is ranked on the same scale as the global percentile.53 is the median sample size across everything we rank. Here n is 443.
Cohort: Films · 1970s
