pdf.dist: Distance between densities
In pi0: Estimating the proportion of true null hypotheses for FDR

Description Usage Arguments Details Value Author(s) Examples

Compute the distance between two density functions

1	pdf.dist(f1, f2, method = c("Hellinger", "abdif"))

`f1,f2`	Two functions of one argument, both of which are densities defined over the whole real line.
`method`	character; specifying the definition of distance. Current choices are `Hellinger` and `abdif`, the latter of which is the integrated absolute differences between the two function.

Numerical integration is performed from -Inf to Inf. Hence, the two functions must be able to accept arguments over the whole real line.

a numeric scalar which is the computed distance, or NA_real_ if any problem occurs.

Long Qu

# Hellinger distance betwee standard normal and log-normal
pdf.dist(dnorm, dlnorm, 'Hell') # 0.5981035

# absolute difference between standard normal and standard cauchy
f2=function(x)dt(x,1)
pdf.dist(dnorm, f2, 'abd')  #[1] 0.5023312