A non-parametric test for comparing two survival curves (see hazard rate), which results from the work of Sir David Cox and Nathan Mantel. Denote the total number of deaths in the second group by D2, and let the ordered survival times of the combined group be t(1)<t(2)<⋯<t(k). The test statistic, C, is given by C = U/, where
and m(j) is the number of survival times equal to t(j), d(j) is the total number of individuals who died (or were censored) at time t(j), and p(j) is the proportion of these who were in the second group. If the differences between the survival curves are attributable to random variation then C has a standard normal distribution.
- control electrode
- control element
- control flow
- control-flow graph
- control grid
- control group
- control key
- controlled-carrier modulation
- controlled crash
- controlled sharing
- controlled sources
- controlled substance
- controlled system
- controlled variable
- controller
- controller tuning
- control line
- control location
- control loop
- control mechanism
- control memory
- control mode
- control moment gyroscope
- control((of a company))
- control plane