9/21/2023 0 Comments Graphpad prism 8 number at riskIf some subjects were censored, then subjects were not all followed for the same duration, so computation of the survival fraction is not straightforward (and what the Kaplan-Meier method is for). While it seems intuitive that the curve ought to end at a survival fraction computed as the total number of subjects who died divided by the total number of subjects, this is only correct if there are no censored data. This makes the computation of survival percentage somewhat tricky. Subjects whose data are censored-either because they left the study, or because the study ended - can't contribute any information beyond the time of censoring. ![]() ![]() The calculations take into account censored observations. This table contains the numbers used to graph survival vs. For each X value (time), Prism shows the fraction (or percentage) still alive (or the fraction or percentage already dead, if you chose to begin the curve at 0.0 rather than 1.0). Prism calculates survival proportions using the product limit (Kaplan-Meier) method. It is used to make a graph, but you won't see the analysis tab until you turn it on in the analysis tab menu. ![]() The analysis tab for survival proportions or percentages is invisible by default.
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