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Creating histograms in SAS is a simple process that involves using the Histogram statement and the VBar statement. To create a histogram, you must first identify the variable you want to plot. Then, you can use the Histogram statement to create a simple histogram, or the VBar statement to create a more complex histogram. You can also add additional options like the title, order, and width of the bars. Examples of this include using the Histogram statement to plot a single variable, using the VBar statement to plot multiple variables, and using the VBar statement to plot a single variable with multiple levels.
You can use the following methods to create one or more histograms in SAS:
Method 1: Create One Histogram
proc univariate data=my_data; var var1; histogram var1; run;
Method 2: Create Panel of Histograms
proc univariate data=my_data; class var2; var var1; histogram var1; run;
Method 3: Overlay Histograms
proc univariate data=my_data; class var2; var var1; histogram var1 / overlay; run;
The following examples show how to use each method with the following dataset in SAS:
/*create dataset*/ data my_data; input team $ points rebounds; datalines; A 29 8 A 23 6 A 20 6 A 21 9 A 33 14 A 35 11 A 31 10 B 21 9 B 14 5 B 15 7 B 11 10 B 12 6 B 10 8 B 15 10 ; run; /*view dataset*/ proc print data=my_data;
Example 1: Create One Histogram
The following code shows how to create one histogram for the points variable:
/*create histogram for points variable*/
proc univariate data=my_data;
var points;
histogram points;
run;
The x-axis displays the values for the points variable and the y-axis displays the percentage of observations in the dataset that fall into various values.
Example 2: Create Panel of Histograms
The following code shows how to create a panel of histograms to visualize the distribution of values for the points variable grouped by the team variable:
/*create histogram for points variable*/
proc univariate data=my_data;
class team;
var points;
histogram points;
run;
This plot allows us to quickly see that the players on team A tend to score more points than the players on team B.
Notice that the two histograms share an x-axis, which makes it easy to compare the points values between the two teams.
Method 3: Overlay Histograms
The following code shows how to overlay multiple histograms in one plot:
/*create histogram for points variable*/
proc univariate data=my_data;
class team;
var points;
histogram points / overlay;
run;
This type of plot is useful when you want to visualize multiple histograms in a single chart.
The following tutorials explain how to create other charts in SAS: