make_parspace: Define parameter for cognitive models In JanaJarecki/cogscimodels: Cognitive Models - Estimation, Prediction, and Development of Models for Cognitive Scientists

Description

`make_parspace()` makes a n x 4 matrix with the parameter bounds, starting value, and no-effect value of parameters

Usage

 `1` ```make_parspace(...) ```

Arguments

 `...` Parameters and their ranges, e.g., `make_parspace(theta = c(ub=-1, lb=1, init=0, na=0), gamma = c(0,2,1,NA))`. See details and examples. The general schema per parameter is a named vector `parametername = c(ub = #, lb = #, init = #, na = #)`. `"lb"`Lower limit, smallest allowed value `"ub"`Upper limit, highest allowed value `"start"` (optional)Initial value for estimation of parameters `"na"` (optional)Value the parameter takes if it should have no effect, can be 'NA'

Details

`"na"` is an optional value a parameter takes such that this parameter has no effect.

To define a parameter α with 0 ≤ α ≤ 1 use one argument, `alpha = c(0,1)`. To define an additional parameter β with 2 ≤ β ≤ 9 use two arguments, `alpha = c(0,1), beta = c(2,9)`, and so forth. You can specify an initial value for the parameter used in fitting as third element of vectors.

Value

A matrix with as many rows as parameters, in which the rownames are the parameter names, and four columns lb, ub, init, na that define the lower limit, upper limit, initial value and null-effect-value (optional) for each parameter.

Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32``` ```## Define a parameter "p" that can range from 0-1 make_parspace(p = c(0,1)) makeparspapce(p = c(lb=0, ub=2)) # the same # Note: # Initial value will be the mean of 0 and 1. ## Define a parameter "zeta" from 0-5 ## and set the initial value to 2 make_parspace(zeta = c(lb=0, ub=5, init=2)) make_parspace(zeta = c(0,5,2)) # the same make_parspace(zeta = c(ub=5,lb=0,init=2)) #the same ## Define one parameter "expon" from 0-2 with initial value 0.5 ## and a value of 1 making it have no effect make_parspace(expon = c(0,2,1,1)) make_parspace(expon = c(lb=0,ub=2,init=1,na=1)) #the same ## Define four parameter alpha, beta, gamma, delta make_parspace(alpha = c(lb=0,ub=1,init=0.5,na=0), beta = c(1,10,5,NA), gamma = c(lb=1,ub=2,init=0,na=1), delta = c(1,2,0)) ## Dynamically define new parameter "gamma" and "delta" ## with the same definition (ub, lb, init, na) def <- c(lb = 0, ub = 1, init = 0.5, na = 0) deflist <- list("gamma" = def, "delta" = def) do.call(make_parspace, deflist) ```

JanaJarecki/cogscimodels documentation built on Sept. 8, 2020, 7:28 p.m.