Volunteerism has advantages for the community. So, the measurement of volunteerism is important to research. Some study finds that motivation to volunteer are unidimensional construct. However, there are researchers that obtain evidence that it is multidimensional construct. This study aims to examine the motivation to volunteer construct in Indonesian sample, that never be done in the previous study. The instrument used is the Indonesian adaptation of Volunteer Functions Inventory by Clary et al (1998). Confirmatory Factor Analysis (CFA) used to examine the six dimensions of the construct (Values, Understanding, Social, Career, Protective, and Enhancement). The example of the item is “by becoming a volunteer I don't feel lonely”. Item analysis using Rasch method is examined to check the items of the scale. Result shows that motivation to volunteer in 108 Indonesian sample aged 18-59 years old (M=26.82; SD=5.66) is multidimensional construct (RMSEA0.9; TLI>0.89). Rasch analysis show good person reliability (0.87) and good item reliability (0.96). All items have good psychometric evaluation. However, based on Rasch analysis, it is identified that an item has differential item functioning (DIF). The feeling of being needed when volunteering was higher in the male sample than in the female sample. The findings provide empirical evidence that motivation to volunteer with Indonesian sample is multidimensional construct. Besides, an item should be revised, so there is no gender bias. The findings of this study can be used to develop a further research about motivation to volunteer especially in Indonesia sample with its culture and norm.

Authors:
Valendra Granitha Shandika Puri, Syarif Hidayatullah Islamic State University, Indonesia
Hastin Melur Maharti, Universitas Indonesia, Indonesia

About the Presenter(s)
Valendra Granitha Shandika Puri, M.A. is an assistant professor at the Faculty of Psychology, Syarif Hidayatullah Islamic State University, Indonesia. Her research is concerned with psychometrics and quantitative psychology studies.

Connect on ResearchGate
https://www.researchgate.net/profile/Valendra-Puri

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