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RELIABILITY /VARIABLES=var_list/SCALE (name) = {var_list, ALL} /MODEL={ALPHA, SPLIT[(n)]} /SUMMARY={TOTAL,ALL} /MISSING={EXCLUDE,INCLUDE}

The `RELIABILITY`

command performs reliability analysis on the data.

The `VARIABLES`

subcommand is required. It determines the set of variables
upon which analysis is to be performed.

The `SCALE`

subcommand determines which variables reliability is to be
calculated for. If it is omitted, then analysis for all variables named
in the `VARIABLES`

subcommand will be used.
Optionally, the `name` parameter may be specified to set a string name
for the scale.

The `MODEL`

subcommand determines the type of analysis. If `ALPHA`

is specified,
then Cronbach’s Alpha is calculated for the scale. If the model is `SPLIT`

,
then the variables are divided into 2 subsets. An optional parameter
`n` may be given, to specify how many variables to be in the first subset.
If `n` is omitted, then it defaults to one half of the variables in the
scale, or one half minus one if there are an odd number of variables.
The default model is `ALPHA`

.

By default, any cases with user missing, or system missing values for
any variables given
in the `VARIABLES`

subcommand will be omitted from analysis.
The `MISSING`

subcommand determines whether user missing values are to
be included or excluded in the analysis.

The `SUMMARY`

subcommand determines the type of summary analysis to be performed.
Currently there is only one type: `SUMMARY=TOTAL`

, which displays per-item
analysis tested against the totals.