rderived: Distribution derived by comparable circumstances

In KWB-R/kwb.fcr: Fertilizer chemical risk assessment

Distribution derived by comparable circumstances

Description

This function combines a uniform distribution from minimum to maximum with the upper and lower tail of a normal distribution.

Usage

rderived(n, min, max, a = -Inf)

Arguments

n	Number of samples to be drawn
min	Minimum value of normal comparables
max	Maximum value of normal comparables
a	Minimum of distribution (Default is -Inf)

Details

95%, 2.5% and 2.5% of all drawn values originate from the uniform distribution, the lower tail, and the upper tail of a normal distribution, respectively. The normal distribution is characterized by the mean of minimum and maximum. The standard deviation is derived from the 2.5% and 97.5% quantile definied by the minimum and maximum values. (sd = (max - mean) / 1.959963)

The number of Fields is multiplied by 38 for the uniform distribution, while it is multiplied by 1 for the tails of the normal distribution (38/40 = 95%). Finally, the defined number of fields is randomly drawn from the vector.

Value

numeric vector of length n with randomly drawn values according to the distribution

KWB-R/kwb.fcr documentation built on Nov. 14, 2023, 5:17 a.m.