[R] survival analysis

[Paul Pynsent]

Has anybody written an actuarial (life) survival procedure, this does 
not appear to be an option in the survival package?
This approach is common in orthopaedic surgery to demonstrate the 
survival of prostheses.
I need to apply the "modified" lower conf.int because of the censoring 
over time.
I want a life table which I can then easily plot.
Many thanks

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