A histogram is one of the most commonly used tool to display frequency distribution of events. It shows how often each different value occurs within a set of observations.
Although quite often used interchangably with a Bar chart, there are major differences; a histogram represents density distribution of quantitative variables, whereas the Bar chart repsents frequency distribution of categorical variables. This means in a histogram it is the area of the bar that denotes the value, whereas in a Bar chart it is the height.
A histogram is most efficient when data under analysis is numerical. Generating a histogram involves determining the number of classes (bars in the graph) to be used, the range of data values and the labels for the bar edges.
As a histogram can display tendency of the process/product measurements, it is an effective tool to study whether requisite requirements can be met.
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