UCHART Statement: ANOM Procedure

Output Data Sets

OUTLIMITS= Data Set

The OUTLIMITS= data set saves decision limits and decision limit parameters. The following variables can be saved:

Table 4.20: OUTLIMITS= Data Set

Variable

Description

_ALPHA_

Significance level ($\alpha $)

_GROUP_

Group-variable specified in the UCHART statement

_INDEX_

Optional identifier for the decision limits specified with the OUTINDEX= option

_LDLU_

Lower decision limit for occurrence rates

_LIMITK_

Number of groups

_LIMITN_

Number of opportunity units associated with the decision limits

_TYPE_

Type (estimate or standard value) of _U_

_U_

Value of central line of u chart ($\bar{u}$)

_UDLU_

Upper decision limit for occurrence rates

_VAR_

Response specified in the UCHART statement


Notes:

  1. If the decision limits vary with the number of opportunity units, the special missing value V is assigned to the variables _LDLU_, _UDLU_, and _LIMITN_.

  2. Optional BY variables are saved in the OUTLIMITS= data set.

The OUTLIMITS= data set contains one observation for each response specified in the UCHART statement. For an example, see Saving Decision Limits.

OUTSUMMARY= Data Set

The OUTSUMMARY= data set saves group summary statistics. The following variables are saved:

  • the group-variable

  • a response rate variable, whose name is response suffixed with U

  • a number of opportunity units variable, whose name is response suffixed with N

Given a response name that contains 32 characters, the procedure first shortens the name to its first 16 characters and its last 15 characters, and then it adds the suffix.

Group summary variables are created for each response specified in the UCHART statement. For example, consider the following statements: 

proc anom data=Fabric;
   uchart (Flaws Ndefects)*Treatment / outsummary=Summary
                                       groupn = 30;
run;

The data set summary contains the variables Treatment, FlawsU, FlawsN, NdefectsU, and NdefectsN.

Additionally, the following variables, if specified, are included:

  • BY variables

  • block-variables

  • symbol-variable

  • ID variables

  • _PHASE_ (if the OUTPHASE= option is specified)

OUTTABLE= Data Set

The OUTTABLE= data set saves group summary statistics, decision limits, and related information. Table 4.21 lists the variables that are saved.

Table 4.21: OUTTABLE= Data Set Variables

Variable

Description

_ALPHA_

Significance level ($\alpha $)

_EXLIM_

Decision limit exceeded on u chart

Group

Values of the group variable

_LDLU_

Lower decision limit for group rate

_LIMITN_

Nominal number of opportunity units associated with the decision limits

_SUBU_

Group rate

_SUBN_

Number of opportunity units in group

_UDLU_

Upper decision limit for group rate

_VAR_

Response specified in the UCHART statement


In addition, the following variables, if specified, are included:

  • BY variables

  • block-variables

  • symbol-variable

  • ID variables

  • _PHASE_ (if the READPHASES= option is specified)

Note: The variable _EXLIM_ is a character variable of length 8. The variable _PHASE_ is a character variable of length 48. The variable _VAR_ is a character variable whose length is no greater than 32. All other variables are numeric.