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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.