Statistics Notes: Numerical Examples of Cronbach’s Alpha

Cronbach’s alpha is easy to use to measure consistency of responses. For an example, we may have two variables that should measure the same thing; therefore, those two variables should be correlated. In medical, we can use two variables—ability to walk and ability to climb stairs—to measure impairment of patients having cervical myelopathy. Theoretically, we understand that the impairment will equally affect the both ability to walk and to climb. Thus, we expect a high Cronbach’s alpha for the both variables. Full article: Cronbach’s Alpha.