This study aimed to validate and review the reliability of instrument used to analyse competency of Co-operative Board Members (CBM) in Johor, Malaysia. The instrument was developed to measure 5 constructs namely management and administration (11 items), financial management (9 items), strategic management (7 items), governance management (9 items), and business management (7 items). Rasch Model was utilised to review the validity and reliability of the instrument developed. Analysis on instrument validity was conducted via unidimensionality test, local independence test, item polarity test, and item fit test. Analysis for instrument reliability level was performed by reviewing the Cronbach’s Alpha value, respondent reliability, item reliability and separation value. Results of the unidimensionality test showed that the construct’s standardised mean variance is 51.1% with the biggest secondary dimension in the first contrast recording the variance of 7.5%. Results of the local independence test showed that 2 items did not meet the set requirements. Results of the item polarity test revealed that all items had positive Point Measure Correlation values between 0.37 and 0.86. Results of the item fit test revealed that 36 items in the instrument having the infit mean square value between 0.53 and 1.48 and outfit mean square value between 0.57 and 1.50, while 7 items recorded values outside of the allowable range. In terms of reliability, Cronbach’s Alpha value for each construct to be between 0.96 and 0.98. Respondent reliability value was 0.96, while respondent separation index was 5.17. Meanwhile, item reliability value was 0.85, and item separation index was 2.38. At the end of the analysis, several items were refined, while another one item was further broken down into two more specific questions based on experts’ advice, resulting the final list of items for the actual study to a total of 44 items.
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