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Discussions on``collective e‹cacy'' (CE; Bandura, 1986;1997) in recent research have provided important knowledge about group functions. However, suitable CE scale for theˆeld of sports coaching has not yet been developed. The purpose of present study was to develop a more general and versatile measure, by reconstructing the Collective E‹cacy Scale for Basketball developed by Ikeda and Uchiyama (2012), and to verify its validity and reliability. Moreover, we investigated relationships among CE and gender, performance level. Factor analysis revealed that the Collective E‹cacy Scale for Basketball OŠense (CESBO) comprised 21 items within the following subscales of``Tactics'',``Characteristics'' and``Adjustments'', and its construct validity was certiˆed. With a Cronbach's alpha and an intraclass correlation coe‹cient (ICC), the CESBO was conˆrmed to have high reliability. Regarding concurrent validity, the Japanese versions of Group Environment Questionnaire (GEQ) and Collective E‹cacy Questionnaire for Sports (CEQS) was used as an external criterion. The results supported our hypotheses (pº.05). Also, the result of a two-tailed unpaired t-test indicated that no diŠerence in CESBO was found between female and male athletes (n. s.). Furthermore, one-way ANOVA showed that higher performance level group had a signiˆcantly higher CE score (pº.05). According to analysis of eŠect size, it was suggested that the in‰uence of CE on the collective performance is diŠered by competition categories. Theseˆndings of present study establish support for usefulness of the CESBO.
Discussions on``collective e‹cacy'' (CE; Bandura, 1986;1997) in recent research have provided important knowledge about group functions. However, suitable CE scale for theˆeld of sports coaching has not yet been developed. The purpose of present study was to develop a more general and versatile measure, by reconstructing the Collective E‹cacy Scale for Basketball developed by Ikeda and Uchiyama (2012), and to verify its validity and reliability. Moreover, we investigated relationships among CE and gender, performance level. Factor analysis revealed that the Collective E‹cacy Scale for Basketball OŠense (CESBO) comprised 21 items within the following subscales of``Tactics'',``Characteristics'' and``Adjustments'', and its construct validity was certiˆed. With a Cronbach's alpha and an intraclass correlation coe‹cient (ICC), the CESBO was conˆrmed to have high reliability. Regarding concurrent validity, the Japanese versions of Group Environment Questionnaire (GEQ) and Collective E‹cacy Questionnaire for Sports (CEQS) was used as an external criterion. The results supported our hypotheses (pº.05). Also, the result of a two-tailed unpaired t-test indicated that no diŠerence in CESBO was found between female and male athletes (n. s.). Furthermore, one-way ANOVA showed that higher performance level group had a signiˆcantly higher CE score (pº.05). According to analysis of eŠect size, it was suggested that the in‰uence of CE on the collective performance is diŠered by competition categories. Theseˆndings of present study establish support for usefulness of the CESBO.
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