DIFFERENCE
BETWEEN BAR GRAPHS AND HISTOGRAM
BAR
CHARTS:
A BAR
graph, is a way of showing a comparison of values. It is a chart wherein each
bar is in proportion to the value that it represents. Bar graphs are used to
help organize data
and information.
Here is how to read a bar chart:
§ The columns are
positioned over a label that represents a categorical variable
§ The height of the column indicates the size of the group defined by the
column label
HISTOGRAMS:
A histogram allows a visual interpretation
of data by indicating the number of data points that lie within a range of
values, called a class.
The frequency of data that falls within
each class is depicted by the use of bar.
Like a bar chart, a histogram is made
up of columns plotted on a graph. Usually, there is no space between adjacent
columns. Here is how to read a histogram.
- The columns are positioned
over a label that represents quantitative variable
- The column label can be a
single value or a range of values.
- The height of the bar
corresponds to the relative frequency of the amount of data in a class
The difference between bar chart and histogram:
§ Bar graphs measure
the frequency of categorical data, and the classes for a bar graph are these
categories. On the other hand, histograms are used for data that is at least at
the ordinal level of measurement. The classes for a histogram are ranges of
values
§ One implication of this distinction: it is
always appropriate to talk about the skewness of
a histogram; that is, the tendency of the observations to fall more on the low
end or the high end of the X axis.
§ With bar charts, however, the X axis does
not have a low end or a high end; because the labels on the X axis are
categorical - not quantitative. As a result, it is less appropriate to comment
on the skewness of a bar chart.
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