Output Data Set :: SAS/QC(R) 12.1 User's Guide

Output Data Set

OUTTABLE= Data Set

The OUTTABLE= data set saves univariate statistics and capability indices. The following variables can be saved:

Table 5.4: OUTTABLE= Data Set

Variable	Description
_CP_	capability index $C_{p}$
_CPLCL_	lower confidence limit for $C_{p}$
_CPUCL_	upper confidence limit for $C_{p}$
_CPK_	capability index $C_{pk}$
_CPKLCL_	lower confidence limit for $C_{pk}$
_CPKUCL_	upper confidence limit for $C_{pk}$
_CPL_	capability index
_CPLLCL_	lower confidence limit for
_CPLUCL_	upper confidence limit for
_CPM_	capability index $C_{pm}$
_CPMLCL_	lower confidence limit for $C_{pm}$
_CPMUCL_	upper confidence limit for $C_{pm}$
_CPU_	capability index
_CPULCL_	lower confidence limit for
_CPUUCL_	upper confidence limit for
_CSS_	corrected sum of squares
_CV_	coefficient of variation
_GINI_	Gini’s mean difference
_K_	capability index K
_KURT_	kurtosis
_LSL_	lower specification limit
_MAD_	median absolute difference about the median
_MAX_	maximum
_MEAN_	mean
_MEDIAN_	median
_MIN_	minimum
_MODE_	mode
_MSIGN_	sign statistic
_NMISS_	number of missing observations
_NOBS_	number of nonmissing observations
_P1_	1st percentile
_P5_	5th percentile
_P10_	10th percentile
_P90_	90th percentile
_P95_	95th percentile
_P99_	99th percentile
_PCTGTR_	percentage of observations greater than upper specification limit
_PCTLSS_	percentage of observations less than lower specification limit
_PROBM_	p-value of sign statistic
_PROBN_	p-value of test for normality
_PROBS_	p-value of signed rank test
_PROBT_	p-value of t statistic
_Q1_	25th percentile (lower quartile)
_Q3_	75th percentile (upper quartile)
_QN_	(see Robust Estimates of Scale)
_QRANGE_	interquartile range (upper quartile minus lower quartile)
_RANGE_	range
_SGNRNK_	centered sign rank
_SKEW_	skewness
_SN_	(see Robust Estimates of Scale)
_STD_	standard deviation
_STDGINI_	Gini’s standard deviation
_STDMAD_	MAD standard deviation
_STDMEAN_	standard error of the mean
_STDQN_	standard deviation
_STDQRANGE_	interquartile range standard deviation
_STDSN_	standard deviation
_SUMWGT_	sum of the weights
_SUM_	sum
_TARGET_	target value
_USL_	upper specification limit
_USS_	uncorrected sum of squares
_VARI_	variance
_VAR_	variable name

Note: The variables _CP_, _CPLCL_, _CPUCL_, _CPK_, _CPKLCL_, _CPKUCL_, _CPL_, _CPLLCL_, _CPLUCL_, _CPM_, _CPMLCL_, _CPMUCL_, _CPU_, _CPULCL_, _CPUUCL_, _K_, _LSL_, _PCTGTR_, _PCTLSS_, _TARGET_, and _USL_ are included if you provide specification limits.

The OUTTABLE= data set and the OUT= data set^[15] contain essentially the same information. However, the structure of the OUTTABLE= data set may be more appropriate when you are computing summary statistics or capability indices for more than one process variable in the same invocation of the CAPABILITY procedure. Each observation in the OUTTABLE= data set corresponds to a different process variable, and the variables in the data set correspond to summary statistics and indices.

See CAPTAB1 in the SAS/QC Sample LibraryFor example, suppose you have ten process variables (P1-P10). The following statements create an OUTTABLE= data set named Table, which contains summary statistics and capability indices for each of these variables:

proc capability data=Process outtable=Table noprint;
   var P1-P10;
   specs lsl=5 10 65 35 35 5 25 25 60 15
         usl=175 275 300 450 550 200 275 425 500 525;
run;

The following statements create the table shown in Figure 5.4, which contains the mean, standard deviation, lower and upper specification limits, and capability index $C_{pk}$ for each process variable:

proc print data=Table label noobs;
   var _VAR_ _MEAN_ _STD_ _LSL_ _USL_ _CPK_;
   label _VAR_='Process';
run;

Figure 5.4: Tabulating Results for Multiple Process Variables

Process Capability Analysis of Fluid Weight

Process	Mean	Standard Deviation	Lower Specification Limit	Upper Specification Limit	Capability Index CPK
P1	90.76	57.024	5	175	0.49242
P2	167.32	81.628	10	275	0.43972
P3	224.56	96.525	65	300	0.26052
P4	258.08	145.218	35	450	0.44053
P5	283.48	157.033	35	550	0.52745
P6	107.48	52.437	5	200	0.58814
P7	153.20	90.031	25	275	0.45096
P8	217.08	130.031	25	425	0.49239
P9	280.68	140.943	60	500	0.51870
P10	243.24	178.799	15	525	0.42551

^[15]See OUTPUT Statement: CAPABILITY Procedure for details on the OUT= data set.

PROC CAPABILITY and General Statements

Output Data Set

OUTTABLE= Data Set