Successful Aging Inventory (TSAI-2011): Rasch Partial Credit Model
Background: The present study aimed to evaluate whether the Persian version of the TSAI-2011 has the optimal number of response category in order to determine successful aging issues in older adults. In addition, it sought to determine whether all of the items contributed adequately to their own domain. Methods: In a psychometric study, the Persian version of the TSAI-2011 was completed by 400 men and women aged 60 and above from urban (211 samples) and rural (189 respondents) settings during mid2019. The Rasch partial credit model (PCM) was used to evaluate item statistics and ordering of response categories. Results: The PCM indicated that items 1 and 20 were misfitting. In addition, the PCM revealed that successive response categories for all items were located in the expected order and version of TSAI with 22-items had more internal consistency compared to those of 20 and 24 items. Conclusions: Although Rasch analysis proved that the majority of items are related to their own underlying construct, response categories should be reorganized and evaluated in further studies, especially in older adults who were settled in the nursing homes and community-based settings.
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In SPSS V. 24