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SAS/GRAPH Statements

Example 7. Using BY-group Processing to Generate a Series of Charts


AXIS statement options:








BY statement

OPTIONS statement option:


PATTERN statement option:


TITLE statement:


Sample library member: GBYGMSC1

This example uses a BY statement with the GCHART procedure to produce a separate three-dimensional vertical bar chart for each value of the BY variable TYPE. The three charts, which are shown in Output for BY Value Corn, Output for BY Value Rice, and Output for BY Value Wheat following the code, show leading grain producers for 1995 and 1996.

The program suppresses the default BY lines and instead uses #BYVAL in the TITLE statement text string to include the BY variable value in the title for each chart.

The AXIS1 statement that is assigned to the vertical (response) axis is automatically applied to all three graphs generated by the BY statement. This AXIS statement removes all the elements of the response axis except the label. The same AXIS statement also includes an ORDER= option. Because this option is applied to all the graphs, it ensures that they all use the same scale of response values.

Because no subgroups are specified and the PATTERNID= option is omitted, the color specified in the single PATTERN statement is used by all the bars.

Set the graphics environment.

goptions reset=all border;

Create the data set GRAINLDR. GRAINLDR contains data about grain production in five countries for 1995 and 1996. The quantities in AMOUNT are in thousands of metric tons. MEGTONS converts these quantities to millions of metric tons.

data grainldr;
   length country $ 3 type $ 5;
   input year country $ type $ amount;
1995 BRZ  Wheat    1516
1995 BRZ  Rice     11236
1995 BRZ  Corn     36276
1995 CHN  Wheat    102207
1995 CHN  Rice     185226
1995 CHN  Corn     112331
1995 INS  Wheat    .
1995 INS  Rice     49860
1995 INS  Corn     8223
1995 USA  Wheat    59494
1995 USA  Rice     7888
1995 USA  Corn     187300
1996 BRZ  Wheat    3302
1996 BRZ  Rice     10035
1996 BRZ  Corn     31975
1996 IND  Wheat    62620
1996 IND  Rice     120012
1996 IND  Corn     8660
1996 USA  Wheat    62099
1996 USA  Rice     7771

Create a format for the values of COUNTRY.

proc format;
  value $country "BRZ" = "Brazil"
                 "CHN" = "China"
                 "IND" = "India"
                 "INS" = "Indonesia"
                 "USA" = "United States";

Suppress the default BY line and define a title that includes the BY-value. #BYVAL inserts the value of the BY variable COUNTRY into the title of each report.

options nobyline;
title1 "Leading #byval(type) Producers"
        j=c "1995 and 1996";
footnote1 j=r  "GBYGMSC1 ";

Specify a color for the bars.

pattern1 color=green;

Define the axis characteristics for the response axes. The ORDER= option specifies the range of values for the response axes. ANGLE=90 in the LABEL= option rotates the label 90 degrees. All the other options remove axis elements. The MAJOR=, MINOR=, and VALUE= options remove the tick marks and values. STYLE=0 removes the line. The NOPLANE option removes the three-dimensional plane.

axis1 order=(0 to 550 by 100)
      label=(angle=90 "Millions of Metric Tons")

Define midpoint axis characteristics. The SPLIT= option defines the character that causes an automatic line break in the axis values.

axis2 label=none
      split=" ";

Sort data according to values of BY variable. The data must be sorted before running PROC GCHART with the BY statement.

proc sort data=grainldr out=temp;
     by type;

Generate the vertical bar charts using a BY statement. The BY statement produces a chart for each value of SITE. The FORMAT statement assigns the $COUNTRY. format to the chart variable. Assigning AXIS1 to the RAXIS= option causes all three charts to have the same response axis.

proc gchart data=temp (where=(megtons gt 31));
   by type;
   format country $country.;
   vbar3d country / sumvar=megtons
                    raxis=axis1 name="GBYGMSC1";

Output for BY Value Corn

[Output for BY Value Corn]

Output for BY Value Rice

[Output for BY Value Rice]

Output for BY Value Wheat

[Output for BY Value Wheat]

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