The Khairkar Pie

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Generally, we use the simple method of the "pie" diagram to show spatial or temporal variations in the distribution of various physical-cultural phenomena. This method involves dividing a circle into sectors with each sector representing proportionally the given data for a region or a year, etc., from amongst the total given for regions or years, etc., under consideration.

It is generally felt that this method of pie diagram fails to show simultaneously the spatial and temporal variations in the given data. However, if we employ the "Khairkar Method of Concentric Pie Diagram", we can overcome this difficulty. The method is simple. First, draw the required number of equidistant concentric circles representing various time units or spatial units. Then, draw proportionate sectors in each circle. Thus, one can easily compare the given data both spatially and temporally.

I have given to this method the name the "Khairkar Pie" to honour my Cartography teacher Mrs. Khairkar who was instrumental in helping me get this idea. It so happened during a lecture that she drew two concentric circles while explaining the concept of pie chart. The whole class was of the view that spatial-temporal variation can't be shown by a pie chat. But, her very act of drawing two circles gave me the above insight.

I immediately pointed out to her this method. She approved this creative method of overcoming one of the shortcomings of the traditional pie chart.

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