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Bar Charts is a graph which is very similar to a histogram as these are often used for qualitative or categorical data. They can also be used quite effectively with quantitative data if the number of unique scores in the data set is not large. The bar chart plots the number of times a particular value or category occurs in a data set, with the height representing the number of observations with that score or in that category and the Y-axis could represent any measurement unit such as relative frequency, raw count, percent etc.
Bar Charts are used with categorical data where the categories are usually on the horizontal axis and the bars should be separated from each other by a gap. The number of people (frequency) is on the vertical axis which could be presented as a percentage rather than the actual number of people.
Pie chart is a method of illustrating information by making use of circle as the whole and sections of the circle to represent parts of the whole and the pie chart provides the proportions of the data at a glance and they are useful for representing categorical data such as for example the color of hair.
Histogram is a graphical way of presenting a frequency distribution and it is constructed by first selecting a number of "intervals" that are to be used. The choice is between reducing the information sufficiently while still providing enough variability to picture the shape of the distribution and most of the computer programs that construct histograms will allow to select the number of intervals, as well as their width. If the computer is not informed about how many intervals that are to be used, then it will make the decision based on the data.
Sometimes they can be horizontal also. It looks like a bar chart with the bars together and the difference is that the data collected is either discrete or continuous data which means that the categories of data are related to each other along a continuum. An example is 100 hundred students were studied to see how many would develop to be level 4 or above at English between the years of 19992002.
Bar charts as well as histograms are commonly used to represent data since they allow quick assimilation as well as immediate comparison of information and normally the bars are vertical.
