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BoxPlot

Tukey’s Box-and-Whisker design is often the best way to approach a large dataset when it is not clear what the significant relationships are. The ‘box’ shows the span of the data between the lower and upper quartiles, with a bar drawn at the median value. The ‘Whiskers’ show the total span of the data – you can use the ‘Deciles’ style to have a dotted line drawn from the 10% and 90% points out to the extremes to reduce the visual impact of outliers.

Boxplots may be drawn vertically (the default) or horizontally (useful when the labels are quite long).

SharpPlot sp = new SharpPlot;
sp.SetMargins(12,12,18,4);
years = new int[] {1931,1931,1931,1931,1931,1931,1931,1931,1931,1931,1931,1931,1931,
         1931,1931,1931,1931,1931,1931,1931,1931,1931,1931,1931,1932,1932,1932,1932,
         1932,1932,1932,1932,1932,1932,1932,1932,1932,1932,1932,1932,1932,1932,1932,
         1932,1932,1932,1932,1932};
yield = new int[] {27,48,27,39,32,28,43,55,28,38,29,29,35,47,25,40,29,25,39,50,26,
         41,23,26,26,33,34,32,22,22,36,37,35,26,14,25,27,38,35,20,16,22,26,37,38,32,
         32,22};
sp.SetColors(Color.Orange);
sp.YAxisStyle = YAxisStyles.ForceZero;
sp.DrawBoxPlot(yield,years);

Worked Examples

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