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Health and Its Socioeconomic Indicators - Reliability and Validity Testing of Scales
Juráčková, Veronika ; Remr, Jiří (advisor) ; Hendl, Jan (referee)
The diploma thesis "Health and Socio-economic Indicators - reliability and validity testing of the PSAS" deals with a theoretical concept of health and its socio-economic indicators. A substantial part of the work concentrates on the application of PSAS tools to the Czech population and determining whether the range is reliable and valid for Czech respondents. To determine the reliability, a complex test is used for the whole range through the value of Cronbach's Alpha, and then the Item Response Theory (IRT) is also tested. The IRT test is done using the 18-point Likert's range of responses, of which is the PSAS composed. The validity is tested based on confirmatory factor analysis, using the construct validity as well as analysis of cognitive interviews for face validity. The secondary data analysis is done in SPSS, MPLUS, R, and IRTPRO programs. The last two programs are used to test the lesser known Item Response Theory.
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Impact of Number of Scale Points on Attitude Measurement
Bláhová, Vendula ; Remr, Jiří (advisor) ; Soukup, Petr (referee)
This diploma thesis deals with the rating scales, which are widely used in the attitude measurement, namely with the impact of their length (number of scale points) on measurement, both in terms of cognitive processes in the minds of respondents and impact on the data. Hypotheses, formulated on the basis of the literature and tested using data obtained from a split ballot experiment and cognitive interviews, are related to the comparability of results, distribution of responses and task demands. The Net Promoter Score from the environment of market research, expressing respondent's willingness to recommend a service or company used, is used as an application example. It originally uses 0 to 10 eleven-point scale which is here compared to five-point scale from 1 to 5 using various recoding and rescaling techniques. Analysis shows that rating on eleven-point and five-point scales means two different cognitive tasks for respondents (eleven-point scale is a bit more demanding but more accurate in respondents perception) and that the data differ from each other in terms of distribution of responses - on short range scale, midpoint and extreme positive category are selected more often, while on eleven-point scale, milder positive points are used more often.
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