witness.starting.params: Generate random starting values

In dustinfife/witness: This package fits eyewitness data using Clark's (2003) WITNESS model

Description

This function takes a parameter specification matrix and returns a matrix of random starting values

Usage

  witness.starting.params(parameter.form, values = NULL)

Arguments

parameter.form	A matrix where the rows are the experiments, and the columns are the parameters a, ssp, sfs, c, and wa. To fix parameters across rows, one would simply input the same values. For example, if one wanted all the encoding values (a) to be the same, the first row could consist of only ones. See example.
values	A vector of starting values. If the user wants random starting values, leave as NULL. Otherwise, specify what the starting values should be.

Examples

###### prepare parameter vector
params = matrix(c(rep("e", times=4),
				0, 0, 0, 0,
				"sfs1", "sfs1", "sfs2", "sfs2",
				"cr1", "cr2", "cr1", "cr2",
				1, 1, 1, 1), nrow=4)
		# note: fixes ssp and wa encoding across experiments, but allows sfs/cr to vary
		###### generate initial parameters
st = witness.starting.params(params)
st

dustinfife/witness documentation built on May 15, 2019, 6:05 p.m.