Symbol Definitions for Survival Algorithms

X = Interval number

Lx = Number of cases alive at the beginning of the interval

Dx = Number of cases who died during the interval

Ux = Number of cases untraced (lost to follow up) during the interval

Wx = Number of cases withdrawn alive during the interval

L*x = Adjusted number of cases alive during the interval

Px = Observed survival for the interval

CPx = Cumulative observed survival

P*x = Expected survival for the interval

CP*x = Cumulative expected survival

Rx = Relative survival for the interval

CRx = Cumulative relative survival

SPx = Standard error for the observed interval survival

SCPx = Standard error for the observed cumulative survival

SRx = Standard error for the relative interval survival

SCRx = Standard error for the relative cumulative survival