Graph description: Figure 16. Residual standard deviation of diary PEF after six months after regression on baseline SD and treatment group

This is a graph with two panels.

The first panel shows a histogram of residual standard deviation with a superimposed Normal curve. The distribution is slightly skew to the right and appears to have longer tails than the Normal curve.

The second panel shows a Normal quantile plot of residual standard deviation. The points form a curve which first becomes steeper, then less steep, then steeper again.

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This page maintained by Martin Bland.
Last updated 27 July, 2009.