Question: correct Error message UndefVarError: '@formula not defined Show stack trace... 1 model1 = lm(@formula (students_infected ~ lecturer_mask + box_filter + good_ventilation + student_mask_frac + student_vaccine_frac),

correct

Error message UndefVarError: '@formula" not defined Show stack trace... 1 model1 = lm(@formula (students_infected ~ lecturer_mask + box_filter + good_ventilation + student_mask_frac + student_vaccine_frac), training_data)

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