Tucker

Tucker and Lewis (1973) introduced a reliability coefficient for ML factor analysis. Their example data set was previously reported by Tucker (1958) and taken from Thurstone and Thurstone (1941). The correlation matrix is a 9 x 9 for 710 subjects and has two correlated factors of ability: Word Fluency and Verbal.

datasets

A general purpose toolbox developed originally for personality, psychometric theory and experimental psychology. Functions are primarily for multivariate analysis and scale construction using factor analysis, principal component analysis, cluster analysis and reliability analysis, although others provide basic descriptive statistics. Item Response Theory is done using factor analysis of tetrachoric and polychoric correlations. Functions for analyzing data at multiple levels include within and between group statistics, including correlations and factor analysis. Validation and cross validation of scales developed using basic machine learning algorithms are provided, as are functions for simulating and testing particular item and test structures. Several functions serve as a useful front end for structural equation modeling. Graphical displays of path diagrams, including mediation models, factor analysis and structural equation models are created using basic graphics. Some of the functions are written to support a book on psychometric theory as well as publications in personality research. For more information, see the <https://personality-project.org/r/> web page.

William Revelle

psych

Procedures for Psychological, Psychometric, and Personality
Research

Tucker function

A data frame with 9 observations on the following 9 variables.<dl>
 <dt><code>t42</code></dt>
<dd>Prefixes</dd> <dt><code>t54</code></dt>
<dd>Suffixes</dd> <dt><code>t45</code></dt>
<dd>Chicago Reading Test: Vocabulary</dd> <dt><code>t46</code></dt>
<dd>Chicago Reading Test: Sentences</dd> <dt><code>t23</code></dt>
<dd>First and last letters</dd> <dt><code>t24</code></dt>
<dd>First letters</dd> <dt><code>t27</code></dt>
<dd>Four letter words</dd> <dt><code>t10</code></dt>
<dd>Completion</dd> <dt><code>t51</code></dt>
<dd>Same or Opposite</dd> 
</dl>

Format

9 Cognitive variables discussed by Tucker and Lewis (1973) — Tucker

A data frame with 9 observations on the following 9 variables.<dl>
 <dt><code>t42</code></dt>
<dd>Prefixes</dd>

 <dt><code>t54</code></dt>
<dd>Suffixes</dd>

 <dt><code>t45</code></dt>
<dd>Chicago Reading Test: Vocabulary</dd>

 <dt><code>t46</code></dt>
<dd>Chicago Reading Test: Sentences</dd>

 <dt><code>t23</code></dt>
<dd>First and last letters</dd>

 <dt><code>t24</code></dt>
<dd>First letters</dd>

 <dt><code>t27</code></dt>
<dd>Four letter words</dd>

 <dt><code>t10</code></dt>
<dd>Completion</dd>

 <dt><code>t51</code></dt>
<dd>Same or Opposite</dd>

 
</dl>

Tucker: 9 Cognitive variables discussed by Tucker and Lewis (1973)

Description

Usage

Arguments

Format

Details

References

Examples