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Shared credits
William Girdler averages 5.42, Jon Cedar averages 5.79. Apart that suggests 5.61; together they average 5.35, a lift of −0.26.
Lift is the average of their films together minus the mean of their two career averages.
Dot size shows IMDb votes; lines are rolling five-film averages. Films with fewer than 1,000 votes are left out.
| Day of the Animals | 1977 | 5.3 | 3,708 | Director | as Frank Young |
| The Manitou | 1978 | 5.4 | 3,820 | Director, Producer, Writer | as Dr. Jack Hughes, Writer |