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**Data Analysis [12-15]**

**Histogram**

You can also visualize the frequency statistics by plotting the histogram from Proc Freq.

Let's take a look at the BULBS data set again.

Let's take a look at the BULBS data set again.

__Example__The histogram can be plotted by adding the PLOTS option in the TABLE statement:

__Example__

Proc Freq Data=Bulbs;

Table Type / plots=freqplot;

Run;

The option (plots=freqplot) plots the histogram of the frequency statistics:

Another plot that are commonly plotted is the cumulative frequency plot.

It can be plotted by using the (plots=cumfreqplot) option:

__Example__

Proc Freq Data=Bulbs;

Table Type / plots=cumfreqplot;

Run;

Finally, you can plots both plots using the (plots=all) option:

__Example__

Proc Freq Data=Bulbs;

Table Type / plots=all;

Run;

**Exercise**

Locate the CARS data set from the SASHelp library.

Count how many types of cars are built by each car maker.

Which car maker makes the most variety of cars in this population?

[Hint: it is much easier to find the result using the histogram.]

*Need some help?*

**HINT: **

Simply use Proc Freq on the Make variable.

**SOLUTION: **

Proc Freq Data=SASHelp.cars;

Table Make / plots=freqplot;

Run;

From the histogram, Toyota makes the most variety of cars in this population.

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