Histograms

=__Histograms__=

What are histograms?
Histograms may look like a bar graph, but in reality, both serve really different purposes. Bar graphs show frequency of an item, not grouped or continuous. However, a histogram show frequency of a grouped item, and it is continuous. This is a histogram: And this is a bar graph: Notice the slight differences? These are really important, so pay attention to them. 1. Histogram has joined lines, while bar graph has or has not. 2. Histogram has a range of values as its y axis, while in a bar graph, there is only one value.

Why use histograms?
Histograms are useful if you do not have the exact set of information. Also, like a dot graph, it is used to show distribution, but can be used for tabulating results of large surveys. However, histograms do not display **individual** data, thus if you need to find the highest or lowest, they are not good.