CRITERIA Subcommand (ROC command)
The CRITERIA
subcommand allows the user to decide whether or not the cutoff value
is included as the positive test result value, whether or not the
larger or smaller value direction of the test result variable indicates
the positive test result, the confidence level of the asymptotic
confidence interval produced by /PRINT =
SE
, and the estimation method for the standard error of
the area under the curve.
CUTOFF(INCLUDE). Positive classification
of test result values includes the cutoff values. Note
that the positive test result direction is controlled by the TESTPOS
keyword. This is the active default.
CUTOFF(EXCLUDE). Positive classification of test result values excludes the cutoff values. This distinction leads to the different sets of cutoff values, but none of the output (chart or table) is affected at this moment because the user cannot choose the cutoff values for the classification.
TESTPOS(LARGE). The user can
specify which direction of the test result variable indicates increasing
strength of conviction that the subject is test positive. The larger the test result value is, the more positive the test
result is. LARGE
is the active
default.
TESTPOS(SMALL). The smaller the test result value is, the more positive the test result is.
CI(n). Confidence
level in the (two-sided) asymptotic confidence interval of the area. The user can specify any confidence level in (0, 100) for the asymptotic
confidence interval created by /PRINT =
SE
. The active default parameter value is 95.
DISTRIBUTION(FREE). The method
of calculating the standard error of the area under the curve. When FREE
, the standard error
of the area under the curve is estimated nonparametrically—that
is, without any distributional assumption.
DISTRIBUTION(NEGEXPO). The standard error is estimated assuming the bi-negative exponential distribution. This latter option is valid only when the number of positive actual state observations equals the number of negative actual state observations.