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What is Histogram | Histogram in excel | How to draw a histogram in excel?

A Histogram is a pictorial representation of a set of data, and the most commonly used bar graph for showing frequency distributions of data/values.

It is created by grouping the measurements into “cells” or “class ” or “bins”.

It is similar to the bar chart, but it groups data points into classes and plot frequencies.

Histogram graph is considered one of the basic 7 QC Tools or Seven Basic Quality Improvement Tools and is extensively used in SPC, Lean Manufacturing, and problem-solving techniques such as 8D, PDCA, and  Six Sigma.

Histogram | Histogram in excel

WHEN TO USE A HISTOGRAM

-To summarize large data sets graphically.

-To compare measurements to specifications.

-Assist in decision making.

PURPOSE OR BENEFITS OF HISTOGRAM

– A bar graph that shows the frequency distribution of values/data.

– To assess process capability & to understand variation.

– Useful to understand the spread or variations, location, and shape of the data.

– To know whether a process is stable and predictable.

– To know whether the process produces within specification.

– Process monitoring and centering.

HISTOGRAM IN EXCEL | HISTOGRAM WITH EXAMPLE

Steps for constructing a Frequency distribution graph or Histogram in excel are as follows:

1-Count the number of data points ‘n’.

2- Compute the range of data. The range ‘R’ is the difference between the largest and the smallest value in the sample.

Histogram in excel

3- Determine the number of classes or intervals i.e. class size

Histogram | Class size selection table

4- Compute class width.

Histogram Graph | Determine the Class width

5- Prepare the Tally sheet or Check sheet by summarizing data on it.

6- Count the number of parts in each interval i.e. Number of frequencies within a particular class.

Check Sheet | Tally Sheet

7- Now plot the graph. Place frequencies on the vertical axis, and class intervals on the horizontal axis.

Histogram with example | Frequency Distribution Graph

8- Interpret the histogram by seeing the shape distribution.

INTERPRETATION OF HISTOGRAM

Interpretation of histogram

See also:

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