addnoise: Creates random errors for use in power.trend.

In emon: Tools for Environmental and Ecological Survey Design

Description

This function is used within power.trend. Distribution of noise can be either Normal, Poisson or Negative Binomial. The mean values are entered as a parameter (possibly generated by function generate.trend). Other parameters (sd for Normal, nbsize for Negative Binomial) need to be given. Values in meanvalues are used as the mean values for one of the three specified distributions and then a random allocation is made for each of the nobs values, where nobs is the length of meanvalues.

Usage

addnoise(meanvalues, reps, distribution, sd, nbsize, randeffect, randeffect.sd) 

Arguments

meanvalues	Vector of mean values
reps	Number of replicates per time point
distribution	Character string which must be one of Normal (default), Poisson or Negbin
sd	Standard Deviation for Normal distribution
nbsize	Size parameter for Negative Binomial distribution
randeffect	Not working yet
randeffect.sd	Not working yet

Value

Output is a vector of the same length as meanvalues.

Author(s)

David Maxwell: [e-mail]

See Also

generate.trend, power.trend

emon documentation built on May 2, 2019, 10:21 a.m.