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Fig. 1 | BMC Medical Research Methodology

Fig. 1

From: No rationale for 1 variable per 10 events criterion for binary logistic regression analysis

Fig. 1

Graphical representation of separation (complete and quasi-complete) adapted from Albert and Anderson [16]. Sample points for two variables X1 and X2 by outcome (Y): open and filled circles represent different levels of the outcome (Y=0 or 1). (i) No separation; (ii) complete separation by variable X2; (iii) complete separation by variables X1 and X2; (iv) quasi-complete separation by variable X1 and X2

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