bars |
Create an annotate data set to draw error bars |
bars |
Visualizing Categorical Data: bars
$Version: 1.2 (27 Feb 2002)
Michael Friendly
York University
Create an annotate data set to draw error bars
The BARS macro creates an Annotate data set to draw error bars in a plot.
The error bars may be drawn for a response variable displayed on the Y axis
or on the X axis. The other (CLASS=) variable may be character or numeric.
The BARS macro is called with keyword parameters. The VAR= and CLASS=
variables must be specified. The length of the error bars should be
specified with either the BARLEN= parameter or the LOWER= and UPPER=
parameters.
The arguments may be listed within parentheses in any order, separated by
commas. For example:
%bars(class=age, var=logodds, lower=lower, upper=upper);
proc gplot data=mydata;
plot logodds * age / anno=_bars_;
- DATA=
-
Name of input data set [Default:
DATA=_LAST_
]
- VAR=
-
Name of the response variable, to be plotted on the axis given by the BAXIS= parameter.
- CLASS=
-
Name of the independent variable, plotted on the other axis.
- CVAR=
-
Name of a curve variable, when PROC GPLOT is used with the statement
PLOT &VAR * &CLASS = &CVAR
.
- BY=
-
Name of a BY variable for multiple plots, when PROC GPLOT is used with the
statement
BY &BY;
.
- BAXIS=
-
One of X or Y, indicating the axis along which error bars are drawn
[Default:
BAXIS=Y
]
- BARLEN=
-
A numeric variable or constant giving the error bar length, for example,
when the input data set contains a standard error variable or multiple
thereof. If BARLEN= is given, the LOWER= and UPPER= values are ignored, and error bars are drawn at the values
&VAR +- &Z * &BARLEN.
- Z=
-
A numeric value giving the multiplier of the BARLEN=
value used to determine the lower and upper error bar values.
- LOWER=
-
A numeric variable or constant giving the lower error bar value. Use the LOWER= and UPPER= parameters if the error bars are non-symmetric or if the lower and upper
values are contained as separate variables in the input data set.
- UPPER=
-
A numeric variable or constant giving the upper error bar value.
- TYPE=
-
Type of error bars to be drawn: one of
UPPER
, LOWER
, or BOTH
and possibly one of ALT
or ALTBY
.
[Default: TYPE=BOTH
]
TYPE=LOWER
draws only the lower error bars; TYPE=UPPER
draws only the upper error bars;
TYPE=BOTH
draws both upper and lower error bars.
- Use
TYPE=ALT BOTH
to have the error bars alternate (lower, upper) over observations in the
input data set;
- use
TYPE=ALTBY BOTH
to have the error bars alternate over values of the BY= variable.
- SYMBOL=
-
The plotting symbol, drawn at (
&CLASS, &var
). If not specified, no symbols are drawn.
- COLOR=
-
Color for lines and symbols, a character constant (enclosed in quotes), or
variable name [Default:
COLOR='BLACK'
]
- LINE=
-
The Annotate line style used for error bars [Default:
LINE=1
]
- SIZE=
-
Size of symbols and thickness of lines [Default:
SIZE=1
]
- BARWIDTH=
-
The width of error bar tops, in data units [Default:
BARWIDTH=.5
]
- OUT=
-
Name of the output data set, to be used as an Annotate data set with PROC
GPLOT [Default:
OUT=_BARS_
]
See also
label Create an Annotate dataset to label observations
points Create an Annotate dataset to draw points in a plot
pscale Construct annotations for a probability scale
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