UCHART Statement: ANOM Procedure

You can read response counts for groups from a DATA= data set specified in the PROC ANOM statement. Each response specified in the UCHART statement must be a SAS variable in the data set. This variable provides the count (number of occurrences) for groups indexed by the group-variable. The group-variable, specified in the UCHART statement, must also be a SAS variable in the DATA= data set. Each observation in a DATA= data set must contain a value for each response and a value for the group-variable. The data set should contain one observation per group. When you use a DATA= data set with the UCHART statement, the GROUPN= option (which specifies the number of inspection units per group) is required. Other variables that can be read from a DATA= data set include

For an example of a DATA= data set, see Creating ANOM Charts for Rates from Group Counts.

You can read decision limits (or parameters from which the decision limits can be calculated) from a LIMITS= data set specified in the PROC ANOM statement. For example, the following statements read decision limit information from the data set Conlims:

proc anom data=Info limits=Conlims;
   uchart Defects*Treatment / groupn = 30;
run;

The LIMITS= data set can be an OUTLIMITS= data set that was created in a previous run of the ANOM procedure. Such data sets always contain the variables required for a LIMITS= data set. The LIMITS= data set can also be created directly using a DATA step. When you create a LIMITS= data set, you must provide one of the following:

In addition, note the following:

You can read group summary statistics from a SUMMARY= data set specified in the PROC ANOM statement. This enables you to reuse OUTSUMMARY= data sets that have been created in previous runs of the ANOM procedure or to read output data sets created with SAS summarization procedures.

A SUMMARY= data set used with the UCHART statement must contain the following variables:

The names of the variables containing the rates and number of occurrence units must be the response name concatenated with the special suffix characters U and N, respectively. For example, consider the following statements:

proc anom summary=Summary;
   uchart (Flaws Ndefects)*Treatment;
run;

The data set Summary must include the variables Treatment, FlawsU, FlawsN, NdefectsU, and NdefectsN.

Note that if you specify a response name that contains 32 characters, the names of the summary variables must be formed from the first 16 characters and the last 15 characters of the response name, suffixed with the appropriate character.

Other variables that can be read from a SUMMARY= data set include

You can read group statistics and decision limits from a TABLE= data set specified in the PROC ANOM statement. This enables you to reuse an OUTTABLE= data set created in a previous run of the ANOM procedure or to create your own TABLE= data set. Because the ANOM procedure simply displays the information read from a TABLE= data set, you can use TABLE= data sets to create specialized ANOM charts.

The following table lists the variables required in a TABLE= data set used with the UCHART statement:

Other variables that can be read from a TABLE= data set include

For an example of a TABLE= data set, see Saving Decision Limits.