R help - Oct 2012 - Checking for different hazard distributions in interval censored data

Hi all!

I have two survival data sets looking at similar effects in different settings.
One data set is only right censored, but the other is interval censored. In the
right censored data set, there is an effect of one factor that causes very
different shapes in survival curves (and non-proportional hazards) and I'd
really like to say that the same factor has a similar effect in the other data
set. However, as the data should really go in an "interval2" Surv
object, I can't use cox.zph or a plot of that to say anything statistical
about the curve shapes or hazards. I can of course just plot the survival curves
and say that they look like they have different shapes, but I was hoping you lot
would have a better idea.

Is there a manual way to plot the curves you get from plot(cox.zph()), perhaps
using an ictest object (from the package interval)? Are there any plotting
methods or tests out there in a package that would help me comment on shapes of
interval censored survival curves? Can I cheat and pretend the data are not
interval censored for the purposes of getting this information? (some way to say
which distribution the curves follow would also be awesome as I've done
something like that using survreg with the right censored data)

This is probably really obscure, so I'm not too hopeful. Any ideas would be
very welcome.

Cheers,

Freya