XCHART 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:
Variable |
Description |
|---|---|
_ALPHA_ |
significance level ( |
_DFE_ |
degrees of freedom for mean square error ( |
_GROUP_ |
group-variable specified in the XCHART statement |
_INDEX_ |
optional identifier for the decision limits specified with the OUTINDEX= option |
_LDLX_ |
lower decision limit for group means |
_LIMITK_ |
number of groups |
_LIMITN_ |
group sample size associated with the decision limits |
_MEAN_ |
weighted average of group means ( |
_MSE_ |
mean square error ( |
_TYPE_ |
type (estimate or standard value) of _MEAN_ and _MSE_ |
_UDLX_ |
upper decision limit for group means |
_VAR_ |
response specified in the XCHART statement |
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). Notes:
In the unbalanced case, the special missing value V is assigned to the variables _LIMITN_, _LDLX_, and _UDLX_ to indicate that the decision limits vary with the group sample size.
Optional BY variables are saved in the OUTLIMITS= data set.
The OUTLIMITS= data set contains one observation for each response specified in the XCHART statement. For an example, see the section Saving Decision Limits.
OUTSUMMARY= Data Set
The OUTSUMMARY= data set saves group summary statistics. The following variables can be saved:
the group-variable
a group mean variable named by response suffixed with X
a group sample size variable named by response suffixed with N
a group standard deviation variable named by response suffixed with S
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 XCHART statement. For example, consider the following statements:
proc anom data=Steel; xchart (Width Diameter)*Lot / outsummary=Summary; run;
The data set Summary contains variables named Lot, WidthX, WidthS, WidthN, DiameterX, DiameterS, and DiameterN. Additionally, the following variables, if specified, are included:
BY variables
block-variables
symbol-variable
ID variables
_PHASE_ (if the OUTPHASE= option is specified)
For an example of an OUTSUMMARY= data set, see the section Saving Summary Statistics for Groups.
OUTTABLE= Data Set
The OUTTABLE= data set saves group summary statistics, decision limits, and related information. The following variables can be saved:
Variable |
Description |
|---|---|
_ALPHA_ |
significance level ( |
_EXLIM_ |
decision limit exceeded (if any) |
group |
values of the group variable |
_LDLX_ |
lower decision limit for group mean |
_LIMITN_ |
nominal sample size associated with the decision limits |
_MEAN_ |
central line |
_SUBN_ |
group sample size |
_SUBX_ |
group mean |
_UDLX_ |
upper decision limit for group mean |
_VAR_ |
response specified in the XCHART 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.
For an example, see the section Saving Decision Limits.