Visualizing Categorical Data: rootgram

The rootgram macro ( get rootgram.sas)

Hanging rootograms for discrete distributions

Usage

The ROOTGRAM macro is called with keyword parameters. The arguments may be listed within parentheses in any order, separated by commas. For example:

  %include catdata(madison);
  %goodfit(data=madison, var=count, freq=blocks, dist=poisson);
  %rootgram(data=fit, var=count, obs=blocks);

Parameters

DATA=

Specifies the name of the input data set [Default: DATA=_LAST_]

VAR=

Specifies the name of the analysis variable, used as the abscissa in the plot.

OBS=

Specifies the bserved frequency variable

EXP=

Expected/fitted frequency [Default: EXP=EXP]

FUNC=

The name of the function applied to ordinate. Use FUNC=NONE to give a plot on the scale of observed frequency. [Default: FUNC=SQRT]

BWIDTH=

Bar width [Default: BWIDTH=.5]

BCOLOR=

Bar color [Default: BCOLOR=GRAYB0]

BTYPE=

Bar type: One of HANG, DEV, or NEEDLE. [Default: BTYPE=HANG]

ANNO=

The name of an input annotate dataset

NAME=

Name of the graphics catalog entry

Example

%include vcd(rootgram);        *-- or include in an autocall library;
%include vcd(goodfit);         *-- or include in an autocall library;

data saxony;
	do males = 0 to 12;
		input families @;
		output;
		end;
	label males='Number of males' families='Number of families';
cards;
3  24  104  286  670  1033  1343 1112  829  478  181  45  7
;
%goodfit(data=saxony, var=males, freq=families, dist=binomial);
%rootgram(data=fit, var=males, obs=families, exp=exp);

See also