METHOD Subcommand (RELIABILITY command)

By default, RELIABILITY uses a computational method that does not require the calculation of a covariance matrix wherever possible. METHOD forces RELIABILITY to calculate the covariance matrix. Only a single specification applies to METHOD:

COVARIANCE. Calculate and use the covariance matrix, even if it is not needed.

If METHOD is not specified, RELIABILITY computes the covariance matrix for all variables on each VARIABLES subcommand only if any of the following is true:

• You specify a model other than ALPHA or SPLIT.
• You request COV, CORR, FRIEDMAN, or HOTELLING on the STATISTICS subcommand.
• You request anything other than TOTAL on the SUMMARY subcommand.
• You write the matrix to a matrix data file, using the MATRIX subcommand.