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CALGB 8541: (a) Survival and log-negative-log of survival distribution by ER status estimated by Kaplan-Meier method. (b) Schoenfeld (1982) residuals of ER status obtained from SAS proc phreg. Residuals above and below the horizontal line are for ER-positive and ER-negative patients, respectively. (c) Estimated survival and log-negative-log of survival distribution by menopausal status.
