in this usage :
power.diagnostic.test(sens = NULL, spec = NULL,
n = NULL, delta = NULL, sig.level = 0.05,
power = NULL, prev = NULL,
method = c("exact", "asymptotic"),
NMAX = 1e4)
what should i put in the argument delta???

this option is used to specify the sens-delta or spec-delta is used as lower confidence limit
It's used to specify the range, in this case delta specific the lower.
see for more details this site: https://cran.r-project.org/web/packages/MKmisc/MKmisc.pdf

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Hi, and thank you for your reply.
Can i put the AUC proportion?