Calculates Cronbach's alpha and standardized alpha (lower bounds on reliability)
for a composite (summated-rating) scale. Standardized alpha is for the sum of the
standardized items. In addition, the function calculates alpha and standardized
alpha for the scale with each item deleted in turn, and computes the correlation
between each item and the sum of the other items.
Usage
reliability(S)
# S3 method for reliability
print(x, digits=4, ...)
Value
an object of class reliability, which normally would be printed.
Arguments
S
the covariance matrix of the items; normally, there should be at least 3 items
and certainly no fewer than 2.
x
reliability object to be printed.
digits
number of decimal places.
...
not used: for compatibility with the print generic."