distplot Plots for discrete distributions distplot

# Visualizing Categorical Data: distplot

\$Version: 1.3 (10 Jan 2001)
Michael Friendly
York University

## The distplot macro ( get distplot.sas)

### Plots for discrete distributions

The DISTPLOT macro constructs plots of a discrete distribution designed to diagnose whether the data follows one of the standard distributions: the Poisson, Binomial, Negative Binomial, Geometric, or Log Series, specified by the DIST= parameter. The usual (PLOT=DIST) plot is constructed so that the points lie along a straight line when the data follows that distribution. An influence plot (PLOT=INFL) shows the influence of each observation on the choice of the distribution parameter(s).

## Usage

The DISTPLOT macro is called with keyword parameters. You must specify the distribution to be fit (DIST=). and the COUNT= and FREQ= variables. The arguments may be listed within parentheses in any order, separated by commas. For example:

%distplot(data=queues, count=women, freq=queues, dist=binomial,
parm=0.435);

### Parameters

DATA=
The name of the input data set [Default: DATA=_LAST_]
COUNT=
Basic count variable
FREQ=
Number of occurrences of count
LABEL=
Horizontal (count) label
DIST=
Name of distribution, one of POISSON, BINOMIAL, GEOMETRIC, or LOGSERIES,
PARM=
Trial value of the distribution parameter(s) to level the plot. For the Binomial distribution, PARM=p, the binomial probability of success; for the Poisson, PARM=lambda, the Poisson mean
Z=
Multiplier for error bars in the PLOT=DIST plot. [Default: Z=1.96]
PLOT=
What to plot: DIST and/or INFL [Default: PLOT=DIST]
HTEXT=
Height of text labels in the plots [Default: HTEXT=1.4]
OUT=
The name of the output data set [Default: OUT=DISTPLOT]
NAME=
Name of the graphics catalog entry [Default: NAME=DISTPLT]

### Example

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

%distplot();