# nesresp: Example Data: Nested Hierarchical Latent Variables In irtrees: Estimation of Tree-Based Item Response Models

## Description

Simulated example data set with nested hierarchical categories.

## Usage

 `1` ```data(nesresp) ```

## Format

An IRT response matrix with 300 persons and 10 four-category items.

## References

De Boeck, P. and Partchev, I. (2012). IRTrees: Tree-Based Item Response Models of the GLMM Family, Journal of Statistical Software – Code Snippets, 48(1), 1–28. https://www.jstatsoft.org/v48/c01/.

## Examples

 ```1 2 3 4 5``` ```str(nesresp) head(nesresp) str(nesrespT <- dendrify(nesresp, cbind(c(0,0,1,1), c(0,1,NA,NA), c(NA,NA,0,1)))) head(nesrespT, 20) ```

### Example output

``` num [1:300, 1:10] 0 0 1 3 0 2 0 2 1 1 ...
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,]    0    0    2    3    2    1    0    0    0     0
[2,]    0    0    2    2    1    1    2    2    0     1
[3,]    1    1    1    3    3    1    2    3    0     2
[4,]    3    2    1    3    2    2    2    3    2     2
[5,]    0    2    2    3    3    1    0    2    2     1
[6,]    2    0    2    3    3    1    0    1    0     2
'data.frame':	6000 obs. of  5 variables:
\$ value : num  0 0 0 1 0 1 0 1 0 0 ...
\$ item  : Factor w/ 10 levels "i01","i02","i03",..: 1 1 1 1 1 1 1 1 1 1 ...
\$ person: Factor w/ 300 levels "p001","p002",..: 1 2 3 4 5 6 7 8 9 10 ...
\$ node  : Factor w/ 3 levels "node1","node2",..: 1 1 1 1 1 1 1 1 1 1 ...
\$ sub   : Factor w/ 30 levels "i01:node1","i01:node2",..: 1 1 1 1 1 1 1 1 1 1 ...
value item person  node       sub
1      0  i01   p001 node1 i01:node1
2      0  i01   p002 node1 i01:node1
3      0  i01   p003 node1 i01:node1
4      1  i01   p004 node1 i01:node1
5      0  i01   p005 node1 i01:node1
6      1  i01   p006 node1 i01:node1
7      0  i01   p007 node1 i01:node1
8      1  i01   p008 node1 i01:node1
9      0  i01   p009 node1 i01:node1
10     0  i01   p010 node1 i01:node1
11     1  i01   p011 node1 i01:node1
12     1  i01   p012 node1 i01:node1
13     0  i01   p013 node1 i01:node1
14     0  i01   p014 node1 i01:node1
15     0  i01   p015 node1 i01:node1
16     0  i01   p016 node1 i01:node1
17     0  i01   p017 node1 i01:node1
18     0  i01   p018 node1 i01:node1
19     0  i01   p019 node1 i01:node1
20     0  i01   p020 node1 i01:node1
```

irtrees documentation built on Dec. 15, 2021, 1:08 a.m.