Results: 0000012588 00000 n Cronbach Alpha is a reliability test conducted within SPSS in order to measure the internal consistency i.e. The output is shown in Figure 5. Inflate this by 1 RMSE to allow for the error, in the observed measures. a) average inter-item correlation is a specific form of internal consistency that is obtained by applying the same construct on each item of the test Click Analyze. o^����@��yB{N�g�, �꠨�9�=��5��Š��!,�v�����jAn։�@ꯗ��6��Ѿ6d�Ǣ��G��^��ð���f`Ai䗆ᄤ�e6ڸ>iQf�k�r�-��]�n@�-��,(�"����C�ŭ79�O:B���s��HK�nXqۉ;���Z�p?���is-� ޵t]%a �`����h�zp1�מUԣ܎����l5G'�D���L׾~R��f�ͨ���4�`� ��bj��ng����bI`K֣x���a����p�5��`X�xt��|��h�����+���mo(#,�5 �}W�k�R/e�c��C*�}՝G��]z)���x�6�[�{��b��IJy�ذ���h���A?���3#Lw�^c6~��?�ت!��(�>Â�?�ͥ K����j}XZ}� ��t���s�K.��p�ø�Ă%ł���A��J�e��q�ň2+G ^����]�ˆ5���'��Ip���*��x���Ϗ7�5c]&. 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Results: It is most commonly used when the questionnaire is developed using multiple likert scale statements and therefore to determine if the scale is reliable or not. Pubmed/Medline, Science Direct, Cochrane Library, and Hinari databases were systematically searched. The reliability of F1 (Cronbach?s Alpha= 0.89, PSI=0.87) and F2 (Cronbach?s Alpha=0.77, PSI=0.87) was good with Cronbach?s Alpha and PSI. G^2/(1+G^2) = (True SD)^2/(Observed SD)^2 = KR-20 or Alpha. 5. Conclusion: Two reviewers independently extracted the psychometric properties of each instrument using the Consensus-based Standard for the Selection of Health Measurement Instruments checklist and examined the methodological quality of each selected study using the MacDermid checklist. Reliability was examined using Cronbach's alpha (α) and the Person Separation Index (PSI), the Rasch equivalent of Cronbach's α, except that it is calculated from the logit scale person estimates [27,30,34]. 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