Confounding factors can be eliminatined by all except-
Randomization is a statistical procedure by which the paicipants are allocated into groups usually called study and control groups to receive or not to receive an experimental, preventive or therapeutic procedure, manoeuvre, intervention. It is an attempt to eliminate bias and allow for comparability. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 90
Matching
Blinding
Randomization
Multivariate analysis
Epidemiology