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Robert Parrish averages 7.06, John Ford averages 7.00. Apart that suggests 7.03; together they average 6.65, a lift of −0.38.
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.
| Four Sons | 1928 | 7.2 | 1,068 | Actor | Director |
| Riley the Cop | 1928 | · | 302 | Actor | Director |
| Men Without Women | 1930 | · | 484 | Actor | Writer, Director |
| Up the River | 1930 | 5.9 | 1,574 | Actor | Director |
| Doctor Bull | 1933 | · | 814 | Actor | Director |
| Judge Priest | 1934 | 6.2 | 2,821 | Actor | Director |
| 1935 | 7.3 | 7,973 | Actor | Director | |
| The Prisoner of Shark Island | 1936 | 7.2 | 2,886 | Actor | Director |
| December 7th | 1943 | 6.1 | 1,102 | Editor | Producer, Director |
| Undercover | 1944 | · | 513 | Editor | Producer, Director, as J. P. Baldwin |