Derive a normal prior for the log hazard ratio parameter based on a guess at the hazard ratio

Derive a normal prior for the log hazard ratio parameter based on a guess at the hazard ratio. This assumes that the log upper limit is 2 standard deviations away from the log median.

Usage

p_hr(median, upper)

Arguments

median

Best guess (prior median) for a typical hazard ratio

upper

Upper limit of 95% credible interval for hazard ratio

Value

A normal prior in the format returned by p_normal, which can be passed directly to the prior_loghr argument in survextrap.