Statistics How To

Make a frequency chart and determine frequency

Probability and Statistics > Descriptive Statistics > Make a Frequency Chart

Make a Frequency Chart: Overview

If you are asked to determine a frequency in statistics, it doesn’t just mean that you should just count out the number of times something happens. It usually involves you having to make a frequency chart to display a list of frequencies.

Make a Frequency Chart

A frequency chart.

A frequency is the number of times a data value occurs. For example, if ten students score 80 in statistics, then the score of 80 has a frequency of 10. Frequency is often represented by the letter f.
A frequency chart is made by arranging data values in ascending order of magnitude along with their frequencies.

Make a Frequency Chart: Steps

Step 1: Make a chart for your data. For this example, you’ve been given a list of twenty blood types for emergency surgery patients:

A, O, A, B, B, AB, B, B, O, A, O, O, O, AB, B, AB, AB, A, O, A.

On the horizontal axis, write “frequency (#)” and “percent (%)”. On the vertical axis, write your list of items. In this example, we have four distinct blood types: A, B, AB, and O.

making a frequency chart

Step 2: Count the number of times each item appears in your data.
In this example, we have:
A appears 5 times.
B appears 5 times.
O appears 6 times.
AB appears 4 times.

Write those in the “number” column (#). This is your frequency.

Step 3:
Use the formula % = (f / n) × 100 to fill in the next column. In this example, n = total amount of items in your data = 20. A appears
5 times (frequency in this formula is just the number of times the item appears). So we have:

(5 / 20) × 100 = 25%

Fill in the rest of the frequency column, changing the ‘f’ for each blood type.

statistics frequency chart

That’s it!

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If you prefer an online interactive environment to learn R and statistics, this free R Tutorial by Datacamp is a great way to get started. If you're are somewhat comfortable with R and are interested in going deeper into Statistics, try this Statistics with R track.

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Make a frequency chart and determine frequency was last modified: October 15th, 2017 by Andale

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