XCHART Statement: CUSUM Procedure

Summary of Options

The following tables list the XCHART statement options by function. Options unique to the CUSUM procedure are listed in Table 6.1, and are described in detail in the section Dictionary of Special Options. Options that are common to both the CUSUM and SHEWHART procedures are listed in Table 6.2. They are described in detail in Dictionary of Options: SHEWHART Procedure.

Table 6.1 XCHART Statement Special Options
Option	Description
Options for Specifying a One-Sided (Decision Interval) Cusum Scheme
DELTA=	specifies shift to be detected as a multiple of standard error
H=	specifies decision interval $\text{[math]}$ ( $\text{[math]}$ ) as a multiple of standard error
HEADSTART=	specifies headstart value $\text{[math]}$ as a multiple of standard error
K=	specifies reference value $\text{[math]}$ ( $\text{[math]}$ )
LIMITN=	specifies fixed nominal sample size for cusum scheme
LIMITN=	specifies that cusums are to be computed for all subgroups regardless of sample size
MU0=	specifies target $\text{[math]}$ for mean
NOREADLIMITS	specifies that cusum parameters are not to be read from LIMITS= data set (SAS 6.10 and later releases)
READINDEX=	reads cusum scheme parameters from a LIMITS= data set
READLIMITS	specifies that cusum parameters are to be read from LIMITS= data set (SAS 6.09 and earlier releases)
SCHEME=ONESIDED	specifies a one-sided scheme
SHIFT=	specifies shift to be detected in data units
SIGMA0=	specifies standard (known) value $\text{[math]}$ for process standard deviation
Options for Specifying a Two-Sided (V-Mask) Cusum Scheme
ALPHA=	specifies probability of Type 1 error
BETA=	specifies probability of Type 2 error
H=	specifies vertical distance between V-mask origin and upper (or lower) arm
K=	specifies slope of lower arm of V-mask
LIMITN=	specifies fixed nominal sample size for cusum scheme
LIMITN=	specifies that cusums are to be computed for all subgroups regardless of sample size
NOREADLIMITS	specifies that cusum parameters are not to be read from LIMITS= data set (SAS 6.10 and later releases)
READINDEX=	reads cusum scheme parameters from a LIMITS= data set
READLIMITS	specifies that cusum parameters are to be read from LIMITS= data set (SAS 6.09 and earlier releases)
READSIGMAS	reads _SIGMAS_ instead of _ALPHA_ from LIMITS= data set when both variables are available
SIGMAS=	specifies probability of Type 1 error as probability that standard normally distributed variable exceeds value in absolute value
Options for Estimating Process Standard Deviation
SMETHOD=	specifies method for estimating process standard deviation $\text{[math]}$
TYPE=	identifies whether _STDDEV_ in OUTLIMITS= data set is an estimate or standard, and specifies value of _TYPE_ in OUTLIMITS= data set
Options for Displaying Decision Interval or V-Mask
CINFILL=	specifies color for area under decision interval line or inside V-mask
CLIMITS=	specifies color of decision interval line
CMASK=	specifies color of V-mask outline
LLIMITS=	specifies line type for decision interval
LMASK=	specifies line type for V-mask arms
NOMASK	suppresses display of V-mask
ORIGIN=	specifies value of subgroup-variable locating origin of V-mask
WLIMITS=	specifies line width for decision interval
WMASK=	specifies line width for V-mask
Tabulation Options
TABLEALL	specifies the options TABLECHART, TABLECOMP, TABLEID, TABLEOUT, and TABLESUMMARY
TABLECHART	tabulates the information displayed in the cusum chart
TABLECOMP	tabulates the computational form of the cusum scheme as described by Lucas (1976) and Lucas and Crosier (1982)
TABLEID	augments TABLECHART and TABLECOMP tables with columns for ID variables
TABLEOUT	augments TABLECHART table with a column indicating if the decision interval or V-mask was exceeded
TABLESUMMARY	tabulates the parameters for the cusum scheme and the average run lengths corresponding to shifts of zero and $\text{[math]}$

Table 6.2 XCHART Statement General Options
Option	Description
Options for Plotting and Labeling Points
ALLLABEL=	labels every point on cusum chart
ALLLABEL2=	labels every point on trend chart
CLABEL=	specifies color for labels
CCONNECT=	specifies color for line segments that connect points on chart
CFRAMELAB=	specifies fill color for frame around labeled points
COUT=	specifies color for portions of line segments that connect points outside control limits
COUTFILL=	specifies color for shading areas between the connected points and control limits outside the limits
LABELANGLE=	specifies angle at which labels are drawn
LABELFONT=	specifies software font for labels
LABELHEIGHT=	specifies height of labels
NOCONNECT	suppresses line segments that connect points on chart
NOTRENDCONNECT	suppresses line segments that connect points on trend chart
OUTLABEL=	labels points outside control limits
SYMBOLLEGEND=	specifies LEGEND statement for levels of symbol-variable
SYMBOLORDER=	specifies order in which symbols are assigned for levels of symbol-variable
TURNALL\|TURNOUT	turns point labels so that they are strung out vertically
Axis and Axis Label Options
CAXIS=	specifies color for axis lines and tick marks
CFRAME=	specifies fill colors for frame for plot area
CTEXT=	specifies color for tick mark values and axis labels
DISCRETE	produces horizontal axis for discrete numeric group values
HAXIS=	specifies major tick mark values for horizontal axis
HEIGHT=	specifies height of axis label and axis legend text
HMINOR=	specifies number of minor tick marks between major tick marks on horizontal axis
HOFFSET=	specifies length of offset at both ends of horizontal axis
INTSTART=	specifies first major tick mark value on horizontal axis when a date, time, or datetime format is associated with numeric subgroup variable
NOHLABEL	suppresses label for horizontal axis
NOTICKREP	specifies that only the first occurrence of repeated, adjacent subgroup values is to be labeled on horizontal axis
NOVANGLE	requests vertical axis labels that are strung out vertically
SKIPHLABELS=	specifies thinning factor for tick mark labels on horizontal axis
SPLIT=	specifies splitting character for axis labels
TURNHLABELS	requests horizontal axis labels that are strung out vertically
VAXIS=	specifies major tick mark values for vertical axis of cusum chart
VAXIS2=	specifies major tick mark values for vertical axis of trend chart
VFORMAT=	specifies format for primary vertical axis tick mark labels
VFORMAT2=	specifies format for secondary vertical axis tick mark labels
VMINOR=	specifies number of minor tick marks between major tick marks on vertical axis
VOFFSET=	specifies length of offset at both ends of vertical axis
WAXIS=	specifies width of axis lines
Plot Layout Options
ALLN	plots means for all subgroups
BILEVEL	creates control charts using half-screens and half-pages
EXCHART	creates control charts for a process only when exceptions occur
INTERVAL=	natural time interval between consecutive subgroup positions when time, date, or datetime format is associated with a numeric subgroup variable
MAXPANELS=	maximum number of pages or screens for chart
NMARKERS	requests special markers for points corresponding to sample sizes not equal to nominal sample size for fixed control limits
NOCHART	suppresses creation of chart
NOFRAME	suppresses frame for plot area
NOLEGEND	suppresses legend for subgroup sample sizes
NPANELPOS=	specifies number of subgroup positions per panel on each chart
REPEAT	repeats last subgroup position on panel as first subgroup position of next panel
TOTPANELS=	specifies number of pages or screens to be used to display chart
TRENDVAR=	specifies list of trend variables
YPCT1=	specifies length of vertical axis on cusum chart as a percentage of sum of lengths of vertical axes for cusum and trend charts
Reference Line Options
CHREF=	specifies color for lines requested by HREF= and HREF2= options
CVREF=	specifies color for lines requested by VREF= and VREF2= options
HREF=	specifies position of reference lines perpendicular to horizontal axis on cusum chart
HREF2=	specifies position of reference lines perpendicular to horizontal axis on trend chart
HREFDATA=	specifies position of reference lines perpendicular to horizontal axis on cusum chart
HREF2DATA=	specifies position of reference lines perpendicular to horizontal axis on trend chart
HREFLABELS=	specifies labels for HREF= lines
HREF2LABELS=	specifies labels for HREF2= lines
HREFLABPOS=	specifies position of HREFLABELS= and HREF2LABELS= labels
LHREF=	specifies line type for HREF= and HREF2= lines
LVREF=	specifies line type for VREF= and VREF2= lines
NOBYREF	specifies that reference line information in a data set applies uniformly to charts created for all BY groups
VREF=	specifies position of reference lines perpendicular to vertical axis on cusum chart
VREF2=	specifies position of reference lines perpendicular to vertical axis on trend chart
VREFLABELS=	specifies labels for VREF= lines
VREF2LABELS=	specifies labels for VREF2= lines
VREFLABPOS=	position of VREFLABELS= and VREF2LABELS= labels
Grid Options
CGRID=	specifies color for grid requested with GRID or ENDGRID option
ENDGRID	adds grid after last plotted point
GRID	adds grid to control chart
LENDGRID=	specifies line type for grid requested with the ENDGRID option
LGRID=	specifies line type for grid requested with the GRID option
WGRID=	specifies width of grid lines
Graphical Enhancement Options
ANNOTATE=	specifies annotate data set that adds features to cusum chart
ANNOTATE2=	specifies annotate data set that adds features to trend chart
DESCRIPTION=	specifies description of cusum chart’s GRSEG catalog entry
FONT=	specifies software font for labels and legends on charts
NAME=	specifies name of cusum chart’s GRSEG catalog entry
PAGENUM=	specifies the form of the label used in pagination
PAGENUMPOS=	specifies the position of the page number requested with the PAGENUM= option
WTREND=	specifies width of line segments connecting points on trend chart

Options for Producing Graphs Using ODS Styles
BLOCKVAR=	specifies one or more variables whose values define colors for filling background of block-variable legend
CFRAMELAB	draws a frame around labeled points
COUT	draw portions of line segments that connect points outside control limits in a contrasting color
CSTAROUT	specifies that portions of stars exceeding inner or outer circles are drawn using a different color
OUTFILL	shades areas between control limits and connected points lying outside the limits
STARFILL=	specifies a variable identfying groups of stars filled with different colors
STARS=	specifies a variable identfying groups of stars whose outlines are drawn with different colors

Options for ODS Graphics
BLOCKREFTRANSPARENCY=	specifies the wall fill transparency for blocks and phases
INFILLTRANSPARENCY=	specifies the control limit infill transparency
MARKERS	plots subgroup points with markers
NOBLOCKREF	suppresses block and phase reference lines
NOBLOCKREFFILL	suppresses block and phase wall fills
NOFILLLEGEND	suppresses legend for levels of a STARFILL= variable
NOPHASEREF	suppresses block and phase reference lines
NOPHASEREFFILL	suppresses block and phase wall fills
NOREF	suppresses block and phase reference lines
NOREFFILL	suppresses block and phase wall fills
NOSTARFILLLEGEND	suppresses legend for levels of a STARFILL= variable
NOTRANSPARENCY	disables transparency in ODS Graphics output
ODSFOOTNOTE=	specifies a graph footnote
ODSFOOTNOTE2=	specifies a secondary graph footnote
ODSLEGENDEXPAND	specifies that legend entries contain all levels observed in the data
ODSTITLE=	specifies a graph title
ODSTITLE2=	specifies a secondary graph title
OUTFILLTRANSPARENCY=	specifies control limit outfill transparency
OVERLAYURL=	specifies URLs to associate with overlay points
OVERLAY2URL=	specifies URLs to associate with overlay points on secondary chart
PHASEPOS=	specifies vertical position of phase legend
PHASEREFLEVEL=	associates phase and block reference lines with either innermost or the outermost level
PHASEREFTRANSPARENCY=	specifies the wall fill transparency for blocks and phases
REFFILLTRANSPARENCY=	specifies the wall fill transparency for blocks and phases
SIMULATEQCFONT	draws central line labels using a simulated software font
STARTRANSPARENCY=	specifies star fill transparency
URL=	specifies a variable whose values are URLs to be associated with subgroups
URL2=	specifies a variable whose values are URLs to be associated with subgroups on secondary chart
Input Data Set Options
MISSBREAK	specifies that observations with missing values are not to be processed
Output Data Set Options
OUTHISTORY=	creates output data set containing subgroup summary statistics
OUTINDEX=	specifies value of _INDEX_ in the OUTLIMITS= data set
OUTLIMITS=	creates output data set containing control limits
OUTTABLE=	creates output data set containing subgroup summary statistics and control limits
Specification Limit Options
CIINDICES	specifies $\text{[math]}$ value and type for computing capability index confidence limits
LSL=	specifies list of lower specification limits
TARGET=	specifies list of target values
USL=	specifies list of upper specification limits

Block Variable Legend Options
BLOCKLABELPOS=	specifies position of label for block-variable legend
BLOCKLABTYPE=	specifies text size of block-variable legend
BLOCKPOS=	specifies vertical position of block-variable legend
BLOCKREP	repeats identical consecutive labels in block-variable legend
CBLOCKLAB=	specifies fill colors for frames enclosing variable labels in block-variable legend
CBLOCKVAR=	specifies one or more variables whose values are colors for filling background of block-variable legend
Phase Options
CPHASELEG=	specifies text color for phase legend
OUTPHASE=	specifies value of _PHASE_ in the OUTHISTORY= data set
PHASEBREAK	disconnects last point in a phase from first point in next phase
PHASELABTYPE=	specifies text size of phase legend
PHASELEGEND	displays phase labels in a legend across top of chart
PHASELIMITS	labels control limits for each phase, provided they are constant within that phase
PHASEREF	delineates phases with vertical reference lines
READPHASES=	specifies phases to be read from an input data set
Star Options
CSTARCIRCLES=	specifies color for STARCIRCLES= circles
CSTARFILL=	specifies color for filling stars
CSTAROUT=	specifies outline color for stars exceeding inner or outer circles
CSTARS=	specifies color for outlines of stars
LSTARCIRCLES=	specifies line types for STARCIRCLES= circles
LSTARS=	specifies line types for outlines of STARVERTICES= stars
STARBDRADIUS=	specifies radius of outer bound circle for vertices of stars
STARCIRCLES=	specifies reference circles for stars
STARINRADIUS=	specifies inner radius of stars
STARLABEL=	specifies vertices to be labeled
STARLEGEND=	specifies style of legend for star vertices
STARLEGENDLAB=	specifies label for STARLEGEND= legend
STAROUTRADIUS=	specifies outer radius of stars
STARSPECS=	specifies method used to standardize vertex variables
STARSTART=	specifies angle for first vertex
STARTYPE=	specifies graphical style of star
STARVERTICES=	superimposes star at each point on cusum chart
WSTARCIRCLES=	specifies width of STARCIRCLES= circles
WSTARS=	specifies width of STARVERTICES= stars
Options for Interactive Control Charts
HTML=	specifies a variable whose values create links to be associated with subgroups
HTML2=	specifies variable whose values create links to be associated with subgroups on secondary chart
HTML_LEGEND=	specifies a variable whose values create links to be associated with symbols in the symbol legend
WEBOUT=	creates an OUTTABLE= data set with additional graphics coordinate data
Options for Line Printer Charts
CONNECTCHAR=	specifies character used to form line segments that connect points on chart
HREFCHAR=	specifies line character for HREF= and HREF2= lines
SYMBOLCHARS=	specifies characters indicating symbol-variable
VREFCHAR=	specifies line character for VREF= and VREF2= lines