I thought this would be trivial, but I can't find a package or function
that does this.

I'm hoping someone can guide me to one.

Imagine a simple case with two survival curves (e.g. treatment & control).

I just want to calculate the difference in KM estimates at a specific time
point (e.g. 1 year) plus the estimate's 95% CI.  The former is
straightforward, but the estimates not so much.

I know methods exist such as Parzen, Wei, and Ying, but was surprised not
to find a package that included this.

Before I code it up, I thought I'd ask if I was just missing it somewhere.

Thank you
Jason

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