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Continue to ChatHow to Solve R Error: contrasts can be applied only to factors with 2 or more levels https://researchdatapod.com/how-to-solve-r-error-contrasts-can-be-applied-only-to-factors-with-2-or-more-levels/
How to Solve R Error: contrasts can be applied only to factors with 2 or more levels https://researchdatapod.com/how-to-solve-r-error-contrasts-can-be-applied-only-to-factors-with-2-or-more-levels/