Degree Of Freedom: df = k - m - 1">m:"
The Kaplan–Meier method is a non parametric method used for the survival analysis. The tool generates the Kaplan-Meier curve with confidence interval and calculates the Log-Rank test for more than of two groups.
Main event (Dt): Maintenance failure, recovery, disease occurrence, death, etc.
Censored event (Ct): the main event didn't happen since the subject left the experiment before the ending time, or due to the termination of the experiment.
nt: number of participants that didn't have event (Main event or censored event).
Proportion surviving interval (Pt): the proportion of survival participants between period t-1 and period t.
Survival rate (St): the proportion of survival participants from period 0 to period t .
Sum = ΣDt/nt(nt - Dt)
S.E: the standard deviation of the survival rate. S.E = St√(Sum)
Lowert: Lower bound of St confidence interval .
Uppert: Upper bound of St confidence interval.