You can refer this paper on Data Consolidation www.carlsonwagonlit.com/.../sites/cwt/en/global/ our_insight/white_papers/white_papers/data_consolidation.pdf
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Different types of graphs are appropriate for different types of data.
graphs,data and illustration
Charts show the data by depicting quantities of different times or different groups altogether
Categorical data varies when there are a variety of different categories.
Conclude that you made a mistake in the way you collected the data