when a patient is dead what is the condition called? why do we use a survival object in r when calculating survival data in r it must be _grouped_ what r data are grouped how to perform survival analysis in r survival analysis in r with grouped data when do r groups use data which survival model has multiple survival objects? can survival analysis be used in r when is r used for survival analysis which statement is an example of a group analysis? what data do you use in survival analysis r grouped data example why is survival analysis grouped how to do survival analysis in r how to use survival data in r r data survival analysis which of the following are survival analysis packages? why is grouping data in survival analysis how to do survival analysis in r with group data