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The UNIVARIATE Procedure |
Alias: | PROB |
Default: | Normal probability plot |
Restriction: | You can specify only one theoretical distribution. |
Tip: | You can use multiple PROBPLOT statements. |
Main discussion: | |
Featured in: | Quantile-Quantile and Probability Plots |
PROBPLOT <variable(s)> </ option(s)>; |
To do this: | Use this option: | |
---|---|---|
Request a distribution | ||
Specify beta probability plot with required shape parameters
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BETA(beta-suboptions) | |
Specify exponential probability plot | EXPONENTIAL(exponential-suboptions) | |
Specify gamma probability plot with a required shape parameter
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GAMMA(gamma-suboptions) | |
Specify lognormal probability plot with a required shape parameter
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LOGNORMAL(lognormal-suboptions) | |
Specify normal probability plot | NORMAL(normal-suboptions) | |
Specify three-parameter Weibull probability plot with a required shape
parameter
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WEIBULL(Weibull-suboptions) | |
Specify two-parameter Weibull probability plot | WEIBULL2(Weibull2-suboptions) | |
Distribution suboptions | ||
Specify shape parameter
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ALPHA= | |
Specify shape parameter
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BETA= | |
Specify shape parameter
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C= | |
Specify
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MU= | |
Specify
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SIGMA= | |
Specify slope of distribution reference line for the lognormal or Weibull2 distribution | SLOPE= | |
Specify
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THETA= | |
Specify
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ZETA= | |
Control appearance of distribution reference line | ||
Specify color of distribution reference line | COLOR= | |
Specify line type of distribution reference line | L= | |
Specify width of distribution reference line | W= | |
Control general plot layout | ||
Create a grid | GRID | |
Specify reference lines perpendicular to the horizontal axis | HREF= | |
Specify labels for HREF lines | HREFLABELS= | |
Specify a line style for grid lines | LGRID= | |
Adjust sample size when computing percentiles | NADJ= | |
Suppress frame around plotting area | NOFRAME | |
Request minor tick marks for percentile axis | PCTLMINOR | |
Specify tick mark labels for percentile axis | PCTLORDER= | |
Adjust ranks when computing percentiles | RANKADJ= | |
Display plot in square format | SQUARE | |
Specify reference lines perpendicular to the vertical axis | VREF= | |
Specify labels for VREF lines | VREFLABELS= | |
Enhance the probability plot | ||
Specify annotate data set | ANNOTATE= | |
Specify color for axis | CAXIS= | |
Specify color for frame | CFRAME= | |
Specify color for HREF= lines | CHREF= | |
Specify color for text | CTEXT= | |
Specify color for VREF= lines | CVREF= | |
Specify description for plot in graphics catalog | DESCRIPTION= | |
Specify software font for text | FONT= | |
Specify number of horizontal minor tick marks | HMINOR= | |
Specify line style for HREF= lines | LHREF= | |
Specify line style for VREF= lines | LVREF= | |
Specify name for plot in graphics catalog | NAME= | |
Specify number of vertical minor tick marks | VMINOR= | |
Enhance the comparative probability plot | ||
Apply annotation requested in ANNOTATE= data set to key cell only | ANNOKEY | |
Specify color for filling frame for row labels | CFRAMESIDE= | |
Specify color for filling frame for column labels | CFRAMETOP= | |
Specify distance between tiles | INTERTILE= | |
Specify number of columns in comparative probability plot | NCOLS= | |
Specify number of rows in comparative probability plot | NROWS= |
Arguments |
Default: | If you omit variable(s) in the PROBPLOT statement then the procedure creates a probability plot for each variable that you list in the VAR statement, or for each numeric variable in the DATA= data set if you omit a VAR statement. |
Requirement: | If you specify a VAR statement, use a subset of the variable(s) that you list in the VAR statement. Otherwise, variable(s) are any numeric variables in the DATA= data set. |
Options |
Requirement: | Enclose this suboption in parentheses following the BETA or GAMMA options. |
Tip: | To compute a maximum likelihood estimate
for
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Requirement: | This option is ignored unless you specify the CLASS statement. |
Tip: | Use the KEYLEVEL= option in the CLASS statement to specify the key cell. |
See also: | the KEYLEVEL= option |
Alias: | ANNO= |
Tip: | The ANNOTATE = data set that you specify in the PROBPLOT statement is used by all plots that this statement creates. You can also specify an ANNOTATE= data set in the PROC UNIVARIATE statement to enhance all the graphics displays that the procedure creates. |
See also: | the ANNOTATE= option in the PROC UNIVARIATE statement |
Requirement: | You must specify the shape parameters with the ALPHA= and BETA= suboptions. |
Interaction: | To create a plot that is based on
maximum likelihood estimates for
![]() ![]() |
Tip: | To obtain graphical estimates of
![]() ![]() ![]() ![]() To assess the point pattern, add a diagonal distribution reference line
that corresponds to the lower threshold parameter
Agreement between the reference line and the point pattern indicates
that the beta distribution with parameters
|
Main discussion: | Beta Distribution |
See also: | the ALPHA= suboption and BETA= suboption |
Alias: | B= |
Requirement: | Enclose this suboption in parentheses after the BETA option. |
Tip: | To compute a maximum likelihood estimate
for
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Requirement: | Enclose this suboption in parentheses after the WEIBULL option or WEIBULL2 option. |
Interaction: | To request a distribution reference line in the WEIBULL2 option, you must specify both the C= and SIGMA= suboptions. |
Tip: | To compute a maximum likelihood estimate
for
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Alias: | CAXES= |
Default: | the first color in the device color list |
Interaction: | This option overrides any COLOR= specification. |
Default: | the area is not filled |
Default: | These areas are not filled. |
Requirement: | This option is ignored unless you specify the CLASS statement. |
Default: | These areas are not filled. |
Requirement: | This option does not apply unless you specify the CLASS statement. |
Default: | the first color in the device color list |
Default: | the first color in the device color list |
Requirement: | You must enclose this suboption in parentheses after a distribution option keyword. |
Default: | the color that you specify for the CTEXT= option in the GOPTIONS statement. If you omit the GOPTIONS statement, the default is the first color in the device color list. |
Alias: | CV= |
Default: | the first color in the device color list |
Alias: | DES= |
Default: | the variable name |
Alias: | EXP |
Tip: | To assess the point pattern, add a diagonal
distribution reference line that corresponds to
![]() ![]() ![]() ![]() Agreement between the reference line and the point pattern indicates
that the exponential distribution with parameters
|
Main discussion: | Exponential Distribution |
See also: | the SIGMA= suboption and the THETA= suboption |
Default: | hardware characters |
Interaction: | FONT=font takes precedence over the FTEXT=font that you specify in the GOPTIONS statement. |
Requirement: | You must specify the shape parameter with the ALPHA= suboption. |
Interaction: | To create a plot that is based on
a maximum likelihood estimate for
![]() |
Tip: | To obtain a graphical estimate of
![]() To assess the point pattern, add a diagonal distribution reference line
that corresponds to the threshold parameter
Agreement between the reference line and the point pattern indicates
that the exponential distribution with parameters
|
Main discussion: | Gamma Distribution |
See also: | the ALPHA= suboption, SIGMA suboption , and THETA suboption |
Default: | 1 |
Alias: | HM= |
Default: | 0 |
See also: | CHREF= option |
Alias: | HREFLABEL= and HREFLAB= |
Restriction: | The number of labels must equal the number of reference lines. Labels can have up to 16 characters. |
1 | positions the labels at the left of the plot |
2 | positions the labels along the top of the plot |
3 | positions the labels from top to bottom |
Default: | 1 |
Default: | The tiles are contiguous. |
Requirement: | This option is ignored unless you specify the CLASS statement. |
Default: | 1, which produces a solid line |
Requirement: | You must enclose this suboption in parentheses after a distribution option. |
Default: | 1, which produces solid lines |
Alias: | LH= |
Default: | 2, which produces a dashed line |
Alias: | LNORM |
Requirement: | You must specify the shape parameter with the SIGMA= suboption. |
Interaction: | To compute a maximum likelihood
estimate for
![]() |
Tip: | To obtain a graphical estimate of
![]() To assess the point pattern, add a diagonal distribution reference line
that corresponds to the threshold parameter
Agreement between the reference line and the point pattern indicates
that the lognormal distribution with parameters
|
Main discussion: | Lognormal Distribution |
See also: | the SIGMA= suboption , SLOPE= suboption , THETA= suboption , and ZETA= suboption |
Default: | 2, which produces a dashed line |
Default: | the sample mean |
Requirement: | You must enclose this suboption in parentheses after the NORMAL option. |
Tip: | Specify the MU= and SIGMA= suboptions together
to request a distribution reference line. Specify MU=EST to request a distribution
reference line with
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Featured in: | Displaying a Reference Line on a Normal Probability Plot |
Default: |
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Default: | UNIVAR |
Alias: | NCOL= |
Default: | NCOLS=1, if you specify only one class variable, and NCOLS=2, if you specify two class variables. |
Requirement: | This option is ignored unless you specify the CLASS statement. |
Interaction: | If you specify two class variables, you can use the NCOLS= option with the NROWS= option. |
Tip: | To assess the point pattern, add a diagonal
distribution reference line that corresponds to
![]() ![]() ![]() ![]() ![]() ![]() Agreement between the reference line and the point pattern indicates
that the normal distribution with parameters
|
Main discussion: | Normal Distribution |
See also: | the MU= suboption and SIGMA= suboption |
Featured in: | Displaying a Reference Line on a Normal Probability Plot |
Alias: | NROW= |
Default: | 2 |
Requirement: | This option is ignored unless you specify the CLASS statement. |
Interaction: | If you specify two class variables, you can use the NCOLS= option with the NROWS= option. |
Featured in: | Displaying a Reference Line on a Normal Probability Plot |
Default: | 1, 5, 10, 25, 50, 75, 90, 95, and 99 |
Range: | 0 ![]() ![]() |
Restriction: | The values that you specify must be in increasing order and cover the plotted percentile range. Otherwise, PROC UNIVARIATE uses the default. |
Default: |
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See also: | the SIGMA= suboption and ZETA= suboption |
See also: | the ALPHA= suboption , SIGMA= suboption , and C= suboption |
Distribution Option | Uses of the SIGMA= Option |
---|---|
BETA, EXPONENTIAL GAMMA, WEIBULL |
THETA=
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LOGNORMAL | SIGMA=
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NORMAL | MU=
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WEIBULL2 | SIGMA=
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Requirement: | You must enclose this suboption in parentheses after the distribution option. |
Tip: | To compute a maximum likelihood estimate
for
![]() |
Featured in: | Displaying a Reference Line on a Normal Probability Plot |
Requirement: | You must enclose this suboption in parentheses after the distribution option. |
Tip: | When you use the LOGNORMAL option and SLOPE=
to request the line, you must also specify a threshold parameter value
![]() ![]() ![]() When you use the WEIBULL2 option and SLOPE= option to request the line,
you must also specify a scale parameter value
For example, the first and second PROBPLOT statements produce the same probability plots as the third and fourth PROBPLOT statements: proc univariate data=measures; probplot width /lognormal(sigma=2 theta=0 zeta=0); probplot width /lognormal(sigma=2 theta=0 slope=1); probplot width /weibull2(sigma=2 theta=0 c=.25); probplot width /weibull2(sigma=2 theta=0 slope=4); |
Main Discussion: | Three-Parameter Weibull Distribution |
Default: | rectangular frame |
Default: | 0 |
Requirement: | You must enclose this suboption in parentheses after the distribution option. |
Interaction: | When you use the WEIBULL2 option,
the THETA= suboption specifies the known lower threshold
![]() When you use the THETA= suboption with another distribution option,
THETA= specifies
|
Alias: | VM= |
Default: | 0 |
See also: | CVREF= option and LVREF= option . |
Alias: | VREFLABEL= and VREFLAB= |
Restriction: | The number of labels must equal the number of reference lines. Labels can have up to 16 characters. |
Default: | 1 |
Requirement: | You must enclose this suboption in parentheses after the distribution option. |
Alias: | WEIB |
Requirement: | You must specify the shape parameter with the C= suboption. |
Interaction: | To create a plot that is based on
a maximum likelihood estimate for
![]() |
Tip: | To obtain a graphical estimate of
![]() To assess the point pattern, add a diagonal distribution reference line
that corresponds to
Agreement between the reference line and the point pattern indicates
that the Weibull distribution with parameters
|
Main discussion: | Three-Parameter Weibull Distribution |
See also | the C= suboption , SIGMA= suboption , and THETA= suboption |
Alias: | W2 |
Tip: | An advantage of the two-parameter Weibull
plot over the three-parameter Weibull plot is that the parameters
![]() ![]() |
Tip: | To obtain a graphical estimate of
![]() To assess the point pattern, add a diagonal distribution reference line
that corresponds to
Agreement between the reference line and the point pattern indicates
that the Weibull2 distribution with parameters
|
Main discussion: | Two-Parameter Weibull Distribution |
See also: | the C= suboption , SIGMA= suboption , SLOPE= suboption , and THETA= suboption |
Requirement: | You must enclose this suboption in parentheses after the LOGNORMAL option. |
Interaction: | To request a distribution reference
line with intercept
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Copyright 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.