It is simple calculation.

pls. open attached link for better understanding

http://www.thestatisticalmind.com/composite-reliability/

the attached file by pramod is very good and applicable.

Greetings,

Composite reliability can be referred as McDonald's coefficient as well. For more detail information, you can refer to the link below. The composite reliability is well explained.

https://www.researchgate.net/post/What_is_the_difference_between_Composite_Reliability_and_Internal_reliability

Hope this is helpful to you. Thanks.

thank's Pramod K Kalambate

thank's Pouyan Ghabezi

thank's Ng Lin Feng

in simple terms

reliability test is done using the spss for the scale validation and remove cross loading.

Composite reliability test focuses on reliability in the CFA analysis. Further, visit the link

http://statwiki.kolobkreations.com/index.php?title=Confirmatory_Factor_Analysis