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Survival Curves Comparison
A survival study leads to calculate variation of survival probability of patients from time t0. We add progressively new patients in the study and, at some times, we count number of alive patients, lost patients, and deceased patients due to studied pathology.
Nevertheless, patients do not integrate simultaneously (but progressively) survival study. However calculation methods use also information supplied by patients that came early in the study, as well as lost patients.
Actuarial method calculates survival probability only at some dates, previously organized. It neglects details of the study between 2 dates of calculation. On the contrary, Kaplan-Meier's method calculates a new survival probability after each death, every information is then taken into account.
Due to its calculation way, actuarial method requires to respect a condition : that survival probability is independent from time, i.e. that survival probability is not modified by apparition, during study, of a new therapy susceptible to increase patients survival.
To download a free demo of the StatEL software, please visit www.adscience.eu
Survival Curves Comparison
A survival study leads to calculate variation of survival probability of patients from time t0. We add progressively new patients in the study and, at some times, we count number of alive patients, lost patients, and deceased patients due to studied pathology.
Nevertheless, patients do not integrate simultaneously (but progressively) survival study. However calculation methods use also information supplied by patients that came early in the study, as well as lost patients.
Actuarial method calculates survival probability only at some dates, previously organized. It neglects details of the study between 2 dates of calculation. On the contrary, Kaplan-Meier's method calculates a new survival probability after each death, every information is then taken into account.
Due to its calculation way, actuarial method requires to respect a condition : that survival probability is independent from time, i.e. that survival probability is not modified by apparition, during study, of a new therapy susceptible to increase patients survival.
To download a free demo of the StatEL software, please visit www.adscience.eu