Psychometrics
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Psychometrics
Actual insights and interesting topics about psychological measurement / psychometrics.
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xxM: software for multilevel / n-Level structural equation modeling

xxM: software for multilevel structural equation modeling (NL-SEM, ML-SEM). Allows large datasets, any number of levels, nesting, cross-classification.
Dr. Guido Möser's insight:

xxM is a new software package to conduct all kinds of multilevel-analyses. You need to create an account before you can download the software.

 

Thanx!

 

 

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semPlot | sachaepskamp.com

Dr. Guido Möser's insight:

semPlot visualizes results from several structural equation modeling software: 

 

Lavaan (R package)

sem (R package)

openMx (R package)

Mplus

LISREL

IBM SPSS AMOS

 

In dependends on the software what is supported: Multiple Groups / Thresholds / Standardized values / Interaction effects etc.

 

 

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Engaging Market Research: The MaxDiff Killer: Rank-Ordered Logit Models

Dr. Guido Möser's insight:

A real alternative to MaxDiff - you don't need any special software to use rank-ordered logit models.

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simsem

simsem : R package for simulated structural equation modeling
Dr. Guido Möser's insight:

This R package is interesting for bulding simulated datasets for structural equation modeling because of the following reasons: 

 

1. Building simulated sampling distribution for fit indices
2. Power analysis
3. Methodological investigations

 

Another possibility to simulate datasets is to use simulateData()-function in lavaan package (http://lavaan.ugent.be/)

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Coding Text Using the “QDAP Method”

Coding Text Using the “QDAP Method” | Psychometrics | Scoop.it
We did it! The free, open source, Web-based, university-hosted, FISMA-compliant

Via Stuart Shulman
Dr. Guido Möser's insight:

This is extremely helpful for all scientists in qualitative analyses! And it is open source - you can host your own version on your server.

 

Project Link: http://cat.ucsur.pitt.edu/

 

Quickstart: http://cat.ucsur.pitt.edu/CAT_quickstart_final.pdf

 

SourceForge: http://sourceforge.net/projects/catoolkit/

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Stuart Shulman's curator insight, January 14, 2013 10:29 AM

Part one of a three-part essay. Though QDAP-UMass will be closing shop soon, the original Pitt QDAP is going strong, and the QDAP method continues to evolve in my commercial text analytics research and development.

Stuart Shulman's comment, January 17, 2013 9:16 AM
Dr. Möser - Thanks! ~Stu
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Engaging Market Research: Item Response Modeling of Customer Satisfaction: The Graded Response Model

Engaging Market Research: Item Response Modeling of Customer Satisfaction: The Graded Response Model | Psychometrics | Scoop.it
Dr. Guido Möser's insight:

Interesting application of IRT (Graded Response Model) 

 

Another article in the series: http://joelcadwell.blogspot.de/2012/09/item-response-theory-developing-your.html

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Dr. Dirk Enzmann | Statistical Software

Dr. Dirk Enzmann | Statistical Software | Psychometrics | Scoop.it
Dr. Guido Möser's insight:

Dr. Enzmann provides an interesting and very helpful collection of his own written "small executables, SPSS macros and scripts, Excel-tamplates, R-functions and Stata ado-files".

 

These are very helpful especially for psychometrics but also in other related fields.

 

Danke!

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Bristol University | Centre for Multilevel Modelling | Web resources for multilevel modelling

Web Resources for Multilevel Modelling/links
Dr. Guido Möser's insight:

University of Bristol - Centre for Multilevel Modelling: Web resources for multilevel modelling

 

Books and related downloads and materials

Reference lists about mulitlevel modelling

Software in general

Training associated with software packages

Free software

Useful software and macros

Experts' Websites

...

Thanks!

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Concerto

Concerto | Psychometrics | Scoop.it
Dr. Guido Möser's insight:

"Concerto is an open-source testing platform that allows users to create various on-line assessment tools, from simple surveys to complex IRT-based Adaptive Tests. Being open-source, Concerto is free for academic and commercial use!" 


General information: https://code.google.com/p/concerto-platform/

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Coursera | Structural Equation Model and its Applications

We are a social entrepreneurship company that partners with the top universities in the world to offer courses online for anyone to take, for free.
Dr. Guido Möser's insight:

Structural Equation Modeling in Chinese Language - Enjoy!

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The Tetrachoric and Polychoric Correlation Coefficients

The Tetrachoric and Polychoric Correlation Coefficients | Psychometrics | Scoop.it
Explanation of the tetrachoric and
the polychoric correlation coefficients. Special attention is given to rater
agreement applications.
Dr. Guido Möser's insight:

Polychoric and tetrachoric correlations

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Simulating normal random variable using polar method in JavaScript

Simulating normal random variable using polar method in JavaScript | Psychometrics | Scoop.it
Dr. Guido Möser's insight:

Tgis serves as a good example and starter how to program statistical applications in JavaScript. The main advantage of JavaScript is that it could easily implemented in Web-Applications. 

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Engaging Market Research: Structural Equation Modeling: Separating the General from the Specific (Part II)

Engaging Market Research: Structural Equation Modeling: Separating the General from the Specific (Part II) | Psychometrics | Scoop.it
Dr. Guido Möser's insight:

Adding a general factor in a CFA.

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rasch.org: Simulating Rasch-Datasets from Marginal Scores

Dr. Guido Möser's insight:

Simulating Rasch-Datasets from Marginal Scores

 

Package RaschSampler - http://www.jstatsoft.org/v20/i04

Download pdf (OpenAccess): http://www.jstatsoft.org/v20/i04/paper

 

R code is included

 

Helpful are the packages irtoys or ltm (descript()-function etc.))

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Item Response Theory by L.M. Rudner

Item Response Theory by L.M. Rudner | Psychometrics | Scoop.it
Provides resources for learning more about item response theory.
Dr. Guido Möser's insight:

Helpful resources for psychometrics by Lawrence M. Rudner - includes a free downloadable version of "The Basics of Item Response Theory" by Frank Baker - http://edres.org/irt/baker/final.pdf ;

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