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# Likert scales and statistics

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### Likert scales and statistics

1. 1. Likert Scale
2. 2. Likert Scale 2
3. 3. Likert Scale User Response Value A Agree 4 B Neutral 3 C Agree 4 D Strongly agree 5 E Disagree 2 The mean would be: 4+3+4+5+2 5 responses = 3.6 That means that the users almost agree with the UI of Wikipedia. 3
4. 4. …and some statistics • There are different kinds of variables:  Categorical or nominal (e.g., colors)  Ordinal (e.g., rate 1 to 10 your happiness)  Interval. The difference between values can be measured, and is the same (lineal intervals)  Ratio. Same as before, but also 0 means 0. E.g., temperature measured in C, 0 does not mean the absence of temperature. 4
5. 5. …and some statistics • What can we do ? Nominal Ordinal Interval Ratio Frequency Yes Yes Yes Yes Median No Yes Yes Yes Add, mean, std. deviation No No Yes Yes Ratio, coef. of variation No No No Yes 5
6. 6. References • Jamieson, S (2004). "Likert Scales: How to (Ab)use Them" Medical Education, Vol. 38(12), pp.1217-1218 • de Winter, J. C. F.; Dodou, D. (2010). "Fivepoint Likert items: t test versus Mann-Whitney-Wilcoxon", Practical Assessment, Research & Evaluation, Vol. 15(11). 6