ItemResponseTrees (version 0.2.5)

irtree_create_template: Create a template of a model string

Description

This function prints a template of a model string to the console based on the supplied data frame. This template can be copy-pasted and modified to define an irtree_model.

Usage

irtree_create_template(data = NULL, mapping_matrix = NULL, rasch = TRUE)

Arguments

data

Data frame.

mapping_matrix

Matrix of so-called pseudo-items, optional. The observed response categories must appear in the first column. The other columns contain the pseudo-items and each entry may be either 1, 0, or NA.

rasch

Logical. The string @1 will be appended to each variable name if TRUE with no effect otherwise.

Examples

# NOT RUN {
irtree_create_template(jackson[, c(1, 6, 11)])
#> m1 <- "
#> Equations:
#> 1 = ...
#> 2 = ...
#> 3 = ...
#> 4 = ...
#> 5 = ...
#>
#> IRT:
#> ... BY E1@1, E2@1, E3@1;
#> ... BY E1@1, E2@1, E3@1;
#>
#> Class:
#> Tree
#> "

irtree_create_template(jackson[, c(1, 6, 11)],
                       cbind(1:5,
                             m = c(0, 0, 1, 0, 0),
                             t = c(1, 1, NA, 0, 0),
                             e = c(1, 0, NA, 0, 1)))
#> m1 <- "
#> Equations:
#> 1 = (1-m)*t*e
#> 2 = (1-m)*t*(1-e)
#> 3 = m
#> 4 = (1-m)*(1-t)*(1-e)
#> 5 = (1-m)*(1-t)*e
#>
#> IRT:
#> m BY E1@1, E2@1, E3@1;
#> t BY E1@1, E2@1, E3@1;
#> e BY E1@1, E2@1, E3@1;
#>
#> Class:
#> Tree
#> "
# }