Likert

• data visualization - Visualizing Likert responses using R or SPSS - Cross Validated [http://stats.stackexchange.com/]

  ---

• scales - Which package to use for convergent and discriminant validity in R? - Cross Validated [http://stats.stackexchange.com/]
• Factor Analysis for Likert/Ordinal/Non-normal Data - Methodspace - home of the Research Methods community [http://www.methodspace.com/]
• Notes on the use of R for psychology experiments and questionnaires [http://www.psych.upenn.edu/]
• Visualizing Likert Items [Updated] « Jason Bryer [http://bryer.org/]
• [http://www.unt.edu/]
• What is the best way used to present the five-point likert scale data? Using mean scores or using percentages ? [http://www.researchgate.net/]
• Adjusting Structural Equation Modelling Of Spiritual Coping Scale: Use Of The Sattora-Bentler Method As An Alternative To Maximum Likelihood Estimation - ISPUB [http://www.ispub.com/]
• VSS criterion for the number of factors (in R's psych package) - Cross Validated [http://stats.stackexchange.com/]
• Visualizing Likert Items | (R news & tutorials)

require(grid)

require(lattice)

require(latticeExtra)

require(HH) Plotting Likert Scales | (R news & tutorials)