> m1 <- clm(categorical_FOD_FODs ~ 0 + Condition_FODs:Language_used_FODs - 1, data = indvar_FODs) Error: response in 'formula' needs to be a factor please define the factors
indvar_FODs$Condition_FODs <- as.factor(indvar_FODs$Condition_FODs) indvar_FODs$Language_used_FODs <- as.factor(indvar_FODs$Language_used_FODs) m1 <- clm(categorical_FOD_FODs ~ 0 + Condition_FODs:Language_used_FODs - 1, data = indvar_FODs) summary(m1)