# How to compare Likert ratings for multiple methods in a usability study

I am designing a questionnaire to compare user experience of usage of a two prototypes of a software - prototype A and B. Users will rate prototype A for a task and then prototype B for performing the same task based on a 5 point Likert scale. The questionnaire will contain 5 questions related to the various measures of user experience and contain ratings for each measure. How can i compare the Likert ratings for the two prototypes using statistical tests?

• Median for central tendency, inter-quartile range for dispersion, Wilcoxon's signed-rank test for testing median difference. Feb 27, 2013 at 17:34
• @Penguin_Knight; i was reading the wikipedia article on the Wilcoxon signed-rank test..is there an example with a software package that i can follow such as Matlab/Excel/SPSS, particular to my case? i am getting confused by the volume of stats jargon(being a software dev and not a ux specialist)..thanks Feb 27, 2013 at 17:40
• Here is a site on how to do it in four common software Feb 27, 2013 at 17:43

• Please don't be hurry. difference in mean rank, the medians are equal. How do you see it with a paired-sample test? Feb 27, 2013 at 18:48