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Shared credits
Fredric March averages 6.71, William Stack averages 6.79. Apart that suggests 6.75; together they average 6.20, a lift of −0.55.
Lift is the average of their films together minus the mean of their two career averages.
Dot size shows audience votes; lines are rolling five-film averages. Films below the source vote floor are left out.
| Sarah and Son | 1930 | · | 13 | as Howard Vanning | as Cyril Belloc |
 Mary of Scotland | 1936 | 6.2 | 43 | as Bothwell | as Ruthven |
| So Ends Our Night | 1941 | · | 13 | as Josef Steiner | as Professor Meyer |
