det_alpha {highriskzone}

calculation of alpha (failure probability), when having the threshold c

Description

This function is used for the intensity-based method. It determines the probability to have at least one unobserved event outside the high-risk zone. A Poisson distribution is used for the number of unobserved events in a certain area or field. Used in functions det_threshold, det_thresholdfromarea.

Usage

det_alpha(intens, threshold, nxprob = 0.1)

Arguments

intens

estimated intensity of the observed process (object of class "im", see density.ppp)

threshold

threshold c: The high-risk zone is the field in which the estimated intensity exceeds this value.

nxprob

probability of having unobserved events

Value

value of alpha