[R] survival data format

[Ido M. Tamir]

Hi,

I have collected data in order to generate a Kaplan Meier Plot (survival 
curve).
However the data does not measure events for individuals but for the whole 
group.
e.g.
day	living		deaths	group
2	16	5	A
2	12	2	B
3	11	0	A
3	10	3	B

Can the survival package do something with this data directly or do I have to
generate a different format first.

Thanks

Ido